Question

can someone help me out please?
solve the system by substitution.
y=x-1
y=-2x+5

Answer 1

we know that y equals y right?
therefore you can get that x - 1 = -2x + 5 then solve for x, what do you get? :)

Answer 2

umm y= (-2x+5) -1? would I start by doing that?

Answer 3

mmm
you would start by solving for x from
x - 1 = -2x + 5

Answer 4

ok... wouldn't that come out as 2?

Answer 5

yep! :D
so now then to get the y value
you plug in what you got for x
back into one of the original equations.

so plug in 2 for x into y = x - 1

Answer 6

so y= (2)-1
=1
y=1?

Answer 7

yep! :D

Answer 8

cool! ok so now would I plug 2 into y=-2x+5 or something, or am I done?

Answer 9

you can do that to double check if you would like :)

but otherwise you should be done.
unless your teacher wants the answer in ordered pair form
which would be (x, y) -> (2, 1)

Answer 10

it doesn't ask for that so sweet, looks like you helped me finish the problem! thank you!

Answer 11

glad I could help :)