Question

Solve the system of equations using elimination. Make sure to show all work and find the value of both x and y

x-3y = 7
3x + 3y = 9
8x+ 3y = 1
4x + 2y = 0

Answer 1

x=4, y=-1. (4, -1).

Explanation:

x-3y=7

3x+3y=9

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x=3y+7

3(3y+7)+3y=9

9y+21+3y=9

12y+21=9

12y=9-21

12y=-12

y=-12/12

y=-1

x-3(-1)=7

x+3=7

x=7-3

x=4