Question

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

-x + 2y = -6
3x + y = 8

-2y + 6

2y - 6

2y + 6

-2y - 6

Answer 1

get x by itself.

Answer 2

Hmm... no idea how to do it!:O Help me Hope! Help meeeee!!

Answer 3

haha start by having x on one side and EVERYTHING else on the other side...SO how would you get the 2y to the other side?

Answer 4

uhhhhh

Answer 5

I'm not sure:(

Answer 6

you would use the opposite sign of what the original is...since this is adding 2y you would do the opposite which is...?

Answer 7

D?

Answer 8

go along with the steps hun :) what is the opposite of addition?

Answer 9

subtraction? lol

Answer 10

yupp! so then you would have -x=-2y-6...BUT the x cannot be negative so you would divide by a negative which would leave you with??

Answer 11

so b?

Answer 12

nope, remeber two negatives cancel out so the -2y would become postive and so would the -6

Answer 13

so it has to be D?!

Answer 14

no, everything that has a "-" would become a "+"
so in -x=-2y-6
all the "-" would become "+"

Answer 15

A!

Answer 16

no, the -2y is still negative...EVERYTHING has to be positive.

Answer 17

so.. obviously it's C.. and I'm dumb lol

Answer 18

that is correct :D and no you are not dumb! dont say that! glad i could help :D