exam Maths Puzzle Numerical Ability

Solve by the substitution method.

4x+7y = 34

-3x+y = 12

Can someone please HELP me with this problem. I do not understand it at all!!

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exam Other Question
Find the length x in the triangle. Express your answer in simplified radical form. Side 1=10. Side 2=8. Side 3=x subtract the first polynomial from the first: 6k + 2c
4k - 3c