ELIMINATION!! How do you work out 4x+7y= 80 and 3x+5y= 58
Mathematics
dayzia
Question
ELIMINATION!! How do you work out 4x+7y= 80 and 3x+5y= 58
2 Answer

1. User Answers BritishAce
Oh, I love elimination <3 Would you like to eliminate x or y? 
2. User Answers apetrostone
3(4x+7y=80)
4(3x+5y=58)
12x+21y=240
12x20y=232
the x's cancel out and you're left with
y=8
then you plug in y and get
4x+7(8)=80
4x+28=80
4x=108
x=27