SOLUTION: solve by using substitution x+y=10 y=x+8

Algebra ->  Expressions-with-variables -> SOLUTION: solve by using substitution x+y=10 y=x+8      Log On


   

Question 413525: solve by using substitution
x+y=10
y=x+8
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

x%2By=10..........1
y=x%2B8...........2....substitute y in 1

x%2By=10..........1

x%2Bx%2B8=10.

2x=10-8.
2x=2.
x=2%2F2...
x=1....now sub. in 2 and find y

y=x%2B8...........2.

y=1%2B8

y=9..
so, your solutions are: x=1 and y=9