X+y=0 and x-y=10 solve by substitution.. How do I figure out the problem!
2 answers:
x+y=0 - x-y=10 -------------- (0)+2y=-10 [x and -x cancel each other out. y minus -y is the same as y+y] y=-5 now substitute -5 in for y in either problem: x+-5=0 x=5
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