Question

If ON = 7x - 5, LM = 6x + 4, NM = x + 6, and OL = 8y + 3, find the values of X and Y for which LMNO must be a parallelogram. Please show your work.
L is top left, M is top right, O is bottom left, N is bottom right.

Answer 1

The values of x and y that will make LMNO a parallelogram are: x = 9, y = 1.5.

Properties of a Parallelogram

• The opposite sides of a parallelogram are parallel to each other and are also of equal lengths.
• Diagonals of a parallelogram are congruent to each other and also bisect each other into equal halves.

Therefore:

ON = LM

Substitute

7x - 5 = 6x + 4

Add like terms

7x - 6x = 5 + 4

x = 9

OL = NM

Substitute

8y + 3 = x + 6

Plug in the value of x

8y + 3 = 9 + 6

8y + 3 = 15

8y = 15 - 3

8y = 12

y = 12/8

y = 1.5

Therefore, the values of x and y that will make LMNO a parallelogram are: x = 9, y = 1.5.

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