Question

solve using substitution
-x+3y=4
2x-6y=-8

Answer 1

Make \(x\) the subject of the first equation :)

Answer 2

would x=3y-4?

Answer 3

yep, then subst it into the second equation :)

Answer 4

awesome then when you substitute it do the 6y cancel?

Answer 5

im stuck at 6y-4-6y=-8

Answer 6

but it's 3y-4 not 6y-4

Answer 7

i thought its 2(3y-4)-6y

Answer 8

oh sorry

Answer 9

wait

Answer 10

try multiplying the first equation by \(-2\)

Answer 11

im confused???? =[

Answer 12

-2x-6=8?

Answer 13

uh you missed out the y

Answer 14

so after multiplying you can see that the first equation is a duplicate of the second equation, so there's only 1 equation at all

Answer 15

oh yea i see what your talking about!!!!! so it all cancels out?

Answer 16

if there's only 1 equation but there's two unknowns, there'll be infinitely many answers

Answer 17

awesome thank you so much!!!!

Answer 18

no problem :)