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# How can I solve x and y to prove that this is a paralellogram?

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- Blue JackLv 62 months ago
Since this is a parallelogram, the center line cuts across two parallel lines, alternate interior angles are equal:

4x + 24 = 124

3x - y = 28

Solve the 2 equations for 2 unknowns:

4x = 124 - 24

4x = 100

x = 25

3(25) - y = 28

-y = 28 - 75

y = 75 - 28

y = 47

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