Linear equation using the elimination method:
x+y=-1
2x - y = 7

(2, -3)

Concept:

There are in general three ways to solve systems of equations

Since the question has requirements, we are going to use elimination for this question.

Solve:

Given equation

x + y = -1

2x - y = 7

Multiply 2 on both sides for the equation

2 (x + y) = 2 (-1)

2x - y = 7

2x + 2y = -2

2x - y = 7

Subtract the second equation from the first to eliminate the [x] variable

(2x + 2y) - (2x - y) = (-2) - (7)

3y = -9

Divide 3 on both sides

3y / 3 = -9 / 3

Find the x values by substituting values into one of the equations

x + y = -1

x + (-3) = -1

x - 3 + 3 = - 1 + 3

Hope this helps!! :)

Please let me know if you have any questions

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step-by-step explanation: