SOLUTION: 7x+y=50 8x+9y=10

Algebra ->  Algebra  -> Coordinate-system -> SOLUTION: 7x+y=50 8x+9y=10      Log On

Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!
Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

   

Question 204137: 7x+y=50
8x+9y=10
Answer by RAY100(1637) About Me  (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