Question

please help me. how would you change x + 3y = 18 -3x -12y = -75 to eliminate y showing all of the work

Answer 1

x = -3

y = 7

Explanation:

x + 3y = 18

-3x - 12y = -75

multiply first equation by 4

4 × (x + 3y) = 18 ➡ 4x + 12y = 72

now add the two equations up

4x + 12y - 3x -12y = 72 - 75 (-12y will eliminate 12y)

x = -3