{7x+4y=5
{2x+2y=1
find x and y
Linear Equations in two known
2009-04-17 7:28 am
回答 (2)
2009-04-17 7:42 am
✔ 最佳答案
{7x+4y=5 (1){2x+2y=1 (2)
(2)x2: 4x+4y=2 (3)
(1)-(2):
3x=3
x=1
Subs x=1 into (1):
7+4y=5
4y=-2
y=0.5
參考: hppt://magic_circle_brain.com
2009-04-17 7:37 am
7x+4y=5----------(1)
2x+2y=1----------(2)
(1)- (2)*2 , 7x-4x=5-2 x=1
sub x into(2) ,2*1+2y= 1
y=-0.5
2x+2y=1----------(2)
(1)- (2)*2 , 7x-4x=5-2 x=1
sub x into(2) ,2*1+2y= 1
y=-0.5
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