Use back-substitution in one of the equations in two variables to find the value of the second variable. We back-substitute -1 for x in either Equation 4 or 5 to find the value of y. We will use Equation 5. -13x + y = 15 Equation 5 -13(-1) + y = 15 Substitute -1 for x. 13 + y = 15 Multiply. y = 2 Subtract 13 from both sides.

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