Question

I need help with substitution​

Answer 1

When I did the work I got the same answer (-7,-15)

Answer 2

(-7,-15)

Explanation:

We can substitute first y in the second y. Both equations are also functions. We can merge the equations.

`2x - 1 = x - 8 \\ 2x - x = - 8 + 1 \\ x = - 7`

Substitute x = -7 in any given equations. I will choose the second equation to substitute in.

`y = x - 8 \\ y = - 7 - 8 \\ y = - 15`

Answer Check

Substitute both x and y in both equations.

`- 15 = 2( - 7) - 1 \\ - 15 = - 14 - 1 \\ - 15 = - 15`

The equation is true for (-7,-15).

`- 15 = - 7 - 8 \\ - 15 = - 15`

The second equation is true for (-7,-15).

Therefore our answer is (-7,-15)