Question

For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

4x − y = 8
2x + 3y = 9

8 − 4x

8 + 4x

−8 + 4x

−8 − 4x

Answer 1

isolated y in the first equation
what do you get?

Answer 2

8-4x

Answer 3

?

Answer 4

what happened to the equal sign?

Answer 5

this is the first equation
4x − y = 8
rearrange to have
y= ....

Answer 6

y = 4x-8

Answer 7

y=8-4x

Answer 8

how come you got two answers?

Answer 9

i accidently re arranged it the wrong way didn't i

Answer 10

but the answer is 8-4x right ?