Question: I'm having trouble solving these linear equations for x and y. my teacher provided the answers but I can't seem to figure it out. 3x+10y=16

I'm having trouble solving these linear equations for x and y. my teacher provided the answers but I can't seem to figure it out.

3x+10y=16 & 2x+7y=10

1st. 12,2 is her answer. .

2nd. x,2/3x-2 is her answer

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