Question

{x+y=17
2x-y=19


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Answer 1

x+y=17
2x-y=19

3x=36
x=36/3
x=12

y=17-12
y=5

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x=17-y

2(17-y)-y=19
34-2y-y=19
-3y=19-34
-3y=-15
y=15/3
y=5

x+5=17
x=17-5
x=12