Question

Substitution

x= -1+2y and x=9-2y

Answer 1

is x=4.5 and y=11/d the answer ?

Answer 2

no, x=4 and y= 2.5, if I were you I would just set the equations equal to each other for this, its a lot easier

Answer 3

do you round your answer ?

Answer 4

Nope, thats the final answer
you can write it as -1+2y = 9- 2y
Then you should get all the y's on on side and all of the numbers on the other
so you can subtract 2y from both sides