algebra help

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2) subtract the two equations to erase the y value (since 2y-2y=0) and solve for x, then add them to erase the x value (since -3x+3x=0) and solve for y. ur x values should be -8.5 and 7.5 respectively. i don't know how to do #1

step by srep the problems

1) x+ y=13
22x + 36y =356

2)-3x +2y=8
3x + 2y=8

#1 use substitution. subsitute y with y=13-X, and solve for x.
22X+36(13-X)=356
-14X=-112
x=8
8+y=13
y=5

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