# Write a system of equations that has exactly one solution

Such a system is known as an underdetermined system. In this situation, they would end up being the same line, so any solution that would work in one equation is going to work in the other. A quantity, y, is measured at several different values of time, t, to produce the following observations.

We work with column 1 first. Two variable system of equations with Infinitely many solutions The equations in a two variable system of equations are linear and hence can be thought of as equations of two lines.

For example, as three parallel planes do not have a common point, the solution set of their equations is empty; the solution set of the equations of three planes intersecting at a point is single point; if three planes pass through two points, their equations have at least two common solutions; in fact the solution set is infinite and consists in all the line passing through these points.

Since the coefficient matrix contains small integers, it is appropriate to use the format command to display the solution in rational format. A nxn nonhomogeneous system of linear equations has a unique non-trivial solution if and only if its determinant is non-zero.

For example; solve the system of equations below Solution: It makes no difference which one you choose. Two variable system of equations with Infinitely many solutions The equations in a two variable system of equations are linear and hence can be thought of as equations of two lines.

In general, a system with the same number of equations and unknowns has a single unique solution. We do this by multiplying row 2 by to form a new row 2. So that will give us a second solution of the homogeneous system. Reducing the above to Row Echelon form can be done as follows: So we just need to look at the determinant of this matrix. The following pictures illustrate this trichotomy in the case of two variables: No Solution If the two lines are parallel to each other, they will never intersect. When these two lines are parallel, then the system has infinitely many solutions.

Multiply both sides of equation 4 by and add the transformed equation 4 to equation 5 to create equation 6 with just one variable. Let us eliminate y first. The solution set is the intersection of these hyperplanes, and is a flatwhich may have any dimension lower than n. Add equation 1 to equation 2 to form Equation 4.

Well, from the second equation, you know that the vector [x, y, z] is orthogonal to the vector 1, minus 1, 2. Substitute 3 for y and 2 for z in equation 1 and solve for x. Krylow method There are examples such as geodesy where there many more measurements than unknowns.

We can do this by multiplying Row 3 by to form a new Row 3. So the determinant of this matrix is 4 minus c. This representation can also be done for any number of equations with any number of unknowns. You can enter the data and view it in a table with the following statements. GO Consistent and Inconsistent Systems of Equations All the systems of equations that we have seen in this section so far have had unique solutions.

Three variable systems of equations with Infinite Solutions When discussing the different methods of solving systems of equations, we only looked at examples of systems with one unique solution set. In general, a system with more equations than unknowns has no solution.

Well, let's go back to the equations that we had. Geometric interpretation[ edit ] For a system involving two variables x and yeach linear equation determines a line on the xy- plane. If you said independent, you are correct. So let's work out what this is. The system has no solution. This happens when as we attempt to solve the system we end up an equation that makes no sense mathematically.

So values of c for which this system has a unique solution are exactly the same as values of c for which the homogeneous system has a unique solution. Now the solutions will be different, of course. But the value of c-- or the values of c-- that make it solvable uniquely, make it solvable uniquely for all right-hand sides.

two systems of equations are giving below for each system choosethe best description of its solution if applicable give solution x+4y=8 -x-4y= -8 choose which one this problem fit in 1)the system has no solution 2) the system has a unique solution (x,y).

A linear system is consistent when it has at least one solution. A linear system is inconsistent when it has no solution. 60 Chapter 2 Solving Systems of Equations and Inequalities Exactly One Solution The planes intersect in a single point.

formulated in terms of systems of linear equations, and we also develop two methods for solving these equations. In addition, we see how matrices (rectangular arrays of numbers) can be used to write systems of linear equations in compact form.

We then go on to consider some real-life Can the system have no solution? Exactly one solution. If the system has exactly one solution, the graph of the linear equations intersect in one point. If the system has no solutions, the graphs of the linear equations are parallel. If the system has an infinite number of solutions, the graphs of the linear equations coincide.

Unformatted text preview: 3* 0 Mathematics Echelon Form 1. Consider the system of linear equations: m+2y—z=1 3m+29+22=7 ~51; +4z=—3 Write this system as an augmented matrix and use Maple to put the matrix in re- duced row echelon form.

Write a system of equations that has exactly one solution
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