solve by linear combination
2007-09-29 09:06:38 · 7 answers · asked by MarieKatie 1 in Science & Mathematics ➔ Mathematics
2x+y=4
x-y=2 Add them together
3x = 6
x = 2 Back substitute to get
y = 0
Doug
2007-09-29 09:14:21 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
x=2, y=0
2007-09-29 09:10:41 · answer #2 · answered by crazydave 7 · 0⤊ 0⤋
equation 1) 2x + y = 4
equation 2) x - y = 2
from eqn 2:
x - y = 2
x = 2 + y
replacing value of x in eqn 1:
2(2 + y) + y = 4
4 + 2y + y = 4
3y = 4 - 4 = 0
y = 0/3 = 0
therefore: x = 2 + 0 = 2
hope this helps. :)
2007-09-29 09:16:43 · answer #3 · answered by VelvetBrick 2 · 0⤊ 0⤋
2x+y=4, x-y=2
Therefore, if x = 2 and y = 0
2 x 2 = 4
and
2 - 0 = 0
I hope this helps! :)
Good Luck
2007-09-29 09:16:25 · answer #4 · answered by Jezzeekah! 1 · 0⤊ 0⤋
On the first one x and y both = 1
On the second one x=4 and y=2
2007-09-29 09:15:09 · answer #5 · answered by Anonymous · 0⤊ 0⤋
x-y = 2 â y = x-2
2x + (x-2) = 4 â 3x = 6 â x = 2
y = 2 - 2 = 0
easy!!!
2007-09-29 09:22:10 · answer #6 · answered by ehsan 1 · 0⤊ 0⤋
Ys canceled and 3x=6, so x=2
2007-09-29 09:09:25 · answer #7 · answered by ValiantAce 2 · 0⤊ 0⤋