Question

−5x+2y=9
y=7x
​x=
y=

Answer 1

`- 5x+2y=9 \\ </p><p>y=7x`

We know that y=7x, so we just need tu put it into the 1st equation

`- 5x + 2 * 7x = 9 \\ - 5x + 14x = 9 \\ 9x = 9 | / 9 \\ 9x / 9 = 9 / 9 \\ x = 1`

So we found x. Now we can find y

`y = 7 * 1 \\ y = 7`

Answer:

x=1, y=7; or (1;7)