How do you solve by substitution $2x-y=23$ and $x-9=-1$ ?

Question

8901 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-04-25T00:56:10

We write the second equation $x= 9 -1 = 8$ and substitute into the first: $2(8) - y = 23$ or $y = 2(8)-23=-7$ .

Check $x=8, y=-7$

$2(8) - (-7) = 16 + 7 = 23 quad sqrt$

$8 - 9 = -1 quad sqrt$

How do you solve by substitution 2x-y=232x-y=23 and x-9=-1x-9=-1?