Question

5x +7 y=-17
4x – 3y = -5
Substitute.

Answer 1

(x,y) = (-2, -1)

Explanation:

We start off by substituting the value of "x".

5x+7y=-17

x=-
`(5)/(4) + (3)/(4)y`

We then solve 5
`5(-(5)/(4)+(3)/(4)y ) +7y= -17`

y=-1 *Substitute the value of "y"

x= -
`-(5)/(4)+(3)/(4)x(-1)`

x=-2

`\left \{ {{-17=-17} \atop {-5=-5}} \right.` This works.