SOLUTION: 3x+5y=8 2x-4y=7 slove x and y

Algebra ->  Expressions-with-variables -> SOLUTION: 3x+5y=8 2x-4y=7 slove x and y       Log On


   

Question 905368: 3x+5y=8
2x-4y=7


slove x and y
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Multiply the first equation by 4 and the second by 5 and add them to eliminate y.
12x%2B20y%2B10x-20y=32%2B35
22x=67
x=67%2F22
.
.
.
Then use either equation to solve for y
3%2867%2F22%29%2B5y=8
201%2F22%2B5y=176%2F22
5y=%28176-201%29%2F22
5y=-25%2F22
y=-5%2F22