SOLUTION: I need help on steps for Solving a system of equations In substituting, Elimination, and graphing method for problem: x+y=10 x-y=2

Question 275950: I need help on steps for Solving a system of equations In substituting, Elimination, and graphing method for problem: x+y=10
x-y=2

Found 2 solutions by mathjames, richwmiller:
Answer by mathjames(8) (Show Source): You can put this solution on YOUR website!
x+y=10
x-y=2
now you can eliminate y to get the value of x
x+y=10
x-y=2
x=12
the value of x is 12
now we will eliminate x to get the value of y
we will multiply the second equation by -1 to eliminate x
x+y=10
-x+y=-2
2y=8
2y/2=8/2
y=4
the value of y is 4

Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x+y=10
x-y=2
by elimination
2x=12
x=6
6-y=2
y=4
by substitution
x+y=10
x-y=2
x=2+y
2+y+y=10
2y=8
y=4
x=2+y=6

to graph
let x=0 and solve for y
x+y=10
x=0 y=10
let y=0
x=10 y=0
x-y=2
let x=0
-y=2
y=-2
let y=0
x=2
plot those points and where the lines cross is the solution
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