Question

For the system of equations below what number do we need to multiply one of the equations by to eliminate one of the variables

3x - 4y=-4
5x-4y=12​

Answer 1

the answer is -1

Explanation:

if you multiply the first equation by -1, you get this:

-3x + 4y = 4

and then you can add that to the second equation and eliminate y

2x + 0y = 16