System of Equations

3X-Y= -8
2X+ 5Y=-45

Simplify to get
Y=?
X=?

Question

System of Equations



3X-Y= -8
2X+ 5Y=-45 

Simplify to get 
Y=? 
X=?

jigglypuff314 · Answer

Hello and Welcome to OpenStudy! :)

would you like to solve this using the elimination method or the substitution method?

anonymous · Answer

hey :)  
which ever method is easier, what do you think?

anonymous · Answer

how about substitution?

jigglypuff314 · Answer

sure :)

3X-Y= -8  isolate the y -> y = 3x + 8  <- then plug in to the one below
2X+ 5Y=-45
so  2x + 5(3x + 8) = -45    distribute
     2x + 15x + 40 = -45
solve for x

anonymous · Answer

x=5?

jigglypuff314 · Answer

close :)
there should be a negative I think

anonymous · Answer

ohh yeah i made a small mistake.. opps 
so x=-5

anonymous · Answer

whats next?

jigglypuff314 · Answer

yep :)
then plug it into one of the original equations
so plug in  x= -5 into   y = 3x + 8
and solve for y

anonymous · Answer

y=-7?

jigglypuff314 · Answer

correct! :)

jigglypuff314 · Answer

you're welcome :)

jigglypuff314 · Answer

you too :) glad I could help :)