Question

please help me solve this problem by using substitution 6x+3y=9 y=−x+4

Answer 1

6x+3y=9
y=−x+4

multiple equation two in (-3) and then sum it to equation one
ok?

Answer 2

but i still dont get how to do it.. , i wish i was smart, like you guys -.-

Answer 3

y = -x + 4
sub -x + 4 in for y in the first equation...
6x + 3(-x + 4) = 9

Now just work it out :)

Answer 4

and once you get x...sub it back into either of the original equations and you will get y :)

Answer 5

so x = 3, and y = -1?

Answer 6

yup:)