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i need to solve for x, which i know, but i just wanted to know whether my set up was fine or not.

yep yep right :=)

so then we can simply it to:
-3x + 9 + 3x = 4

yep

but if we do -3x + 3x = 0x and I am not even sure if there is any such thing as 0x.

yes so they cancel out

thats mean no solution both sides are not equal
\[9 \cancel =4\]

oh okay :)

and for the next one...

yep

hmm you mean
x = -8.5 +3.5 y right ?

yes sorry :)

its okay yep right

-5(-8.5 + 3.5y) - 8y = 17

well i don't understand the 3rd line

if i did 17 - 42.5 = -25.5

yep that's right you need to move 42.5 to the right side then you will get Perfect one

what do you mean by moving 42.5?

i meant you have to subtract 42.5 both sides :=)

correct

so what i did was correct right?

oh yeah

my mistake :\

:=) doing gREAT

y = 1 right?

yep right!

and then we would do:
-5x - 8(1) = 17
-5x - 8 = 17
-5x = 25
x = -5

gO_OD to go!

thanks :) I have another question. it's small and related to basic physics. can u help?

PHYSICS hmmmm not sure

can u just see it? if u can't do it then u don't have to.

ye sure!

okay. here it is...

i'm not sure havn't done physics n a while sorry

okay thank you though :)

np good job!