Question

7x+4y=-4
5x+8y=28
elimination/solve. multiplacation or addition subtraction.

Answer 1

Multiply the top equation by -2.
Add the result to the bottom equation.

Answer 2

14x+8y=-8?

Answer 3

..............

Answer 4

-2. not 2.
You want to eliminate the 'y' term.
then you solve the resulting equation for x. and substitute that value back into either of the first equations to get a value for y.

Answer 5

9x=20

Answer 6

!

Answer 7

mersj...

Answer 8

7x+4y=-4 (1)
5x+8y=28 (2)

-14x-8y=8 <= (1) * -2 = (3)
-9x=36 <= (3) + (2)

Solve for x:
x=-4

Now plug -4 into either (1) or (2) and solve for y.

Answer 9

.....i have no words to express my gratitude.