Solve for y.
2x+3y=9
3x+4y=12
2006-10-10 13:10:12 · 4 answers · asked by Vicky Bendal 1 in Science & Mathematics ➔ Mathematics
Multiply the first equation by 3, and the second one by 2. Then you have
6x+9y=27
6x+8y=24
Now subtract the second equation from the first, and you get
y=3
so x=0.
2006-10-10 13:27:58 · answer #1 · answered by James L 5 · 1⤊ 0⤋
y = 3 and -y = -3
x = 0
2006-10-10 20:41:04 · answer #2 · answered by ♥KiYa♥ 3 · 0⤊ 0⤋
add a multiple of equation 1 to equation 2 that eliminates the x variable is the tactic.
-3 Eq 1: -6x -9y = -27
2 Eq 2: 6x + 8y = 24
-----------------------------------
-y = -3
y = 3
please check for errors
2006-10-10 20:28:54 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Yes!...
... oh... y=3..... Multiply first equation by 3 and multiply second equation by 2, and then subtract equations!
2006-10-10 20:32:18 · answer #4 · answered by Mr. Math 2 · 0⤊ 0⤋