Question 204137: 7x+y=50
8x+9y=10
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! (1) 7x +y =50,,,,,y=(50-7x)
(2) 8x +9y =10
.
subst (1) in (2)
.
8x +9(50-7x) = 10
8x +450 -63x =10
-55x =-440
x=8
.
Subst in (1),,,y=50-7(8),,,,,y= -6
.
check,,,(1) 7(8)+(-6) = 50,,,,ok
(2) 8(8) +9(-6) = 10,,,,,ok
|
|
|
