x+y=17⇒ x=17-y
2x+3y=43
2(17-y)+3y=43
34-2y+3y=43
y=9
x=8
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x+y=17⇒ x=17-y
2x+3y=43
2(17-y)+3y=43
34-2y+3y=43
y=9
x=8