Answer:
y=15
x=43
(any variable can be used, I used x and y to make it easier to show)
Explanation:
x+y=58
x-y=28
get x by its self
x=58-y
then subsitute into the other equation
(58-y)-y=28
58-2y=28
-2y=-30
sub. again
x+15=58
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