Question

Solve by substitution
3x-4y=-4
y=2x-4

Answer 1

x=4 and y=4

Explanation:

From first function we have:

`3x - 4y = - 4 \\ 4y = 3x + 4`

And from the second one:

`y = 2x - 4 \\ 4y = 8x - 16`

Substitute them:

`4y = 3x + 4 \\ 4y = 8x - 16 \\ \\ 0 = - 5x + 20 \\ x = 4 \\ y = 4`