Question

X=2y-4 7x+5y=-66 solve by elimination

Answer 1

{x,y}={-8,-2}

Explanation:

[1] x = 2y - 4

Plug this in for variable x in equation [2]

[2] 7•(2y-4) + 5y = -66

[2] 19y = -38

Solve equation [2] for the variable y

[2] 19y = - 38

[2] y = - 2

By now we know this much :

x = 2y-4

y = -2

Use the y value to solve for x

x = 2(-2)-4 = -8