(2)5x+3y=3 1
The above two formulas add up.
9x=45
Substitute X=5 into (2)
3y=3 1-25=6
y=2
(1)2x-5y=-2 1 both sides× 2, get (3)
(2)4x+3y=23 (subtract from (3))
(3)4x- 10y=-42
13y=65
Substitute Y=5 (1)
2x=-2 1+25=4
x=2
(1)4x+7y=- 19 (subtract from (2))
(2)4x-5y= 17
12y=-36
Y=-3 is substituted into (2)
4x = 17+5y = 17- 15 = 2
x= 1/2
(1)3(x- 1)= y+5- permutation (3)3x-y=8.
(2)5(y- 1)= 3(x+5)-(4)5y-3x = 20。
(3) and (4) are added.
4y=28
Substitute Y=7 into (3)
3x=8+7= 15
x=5