Solve

7x+5y=40

2x+4y=-4

by elimination

Step 1 solve for one variable

2x = - 4 - 4y

x = - 2 - 2y

Step 2 eliminate by substituting into second equation and solve

2 * (-2-2y) + 5y = 40

-4 - 4y + 5y = 40

y = 36

Step 3 put y into any original equation

7x + 5*36 = 40

7x + 180 = 40

7x = - 140

x = - 20

So

X = - 20 and Y = 36