Question

How do you combine the system of equations `-8x + 8y = 0` and `- 9x + 4y = 5`?

Answer 1

`x=y=-1`

Explanation:

From first equation, `8x=8y` or `y=x`

Hence, `-9x+4x=5` or `-5x=5`

Thus, `x=y=5/(-5)=-1`