Find the value of y in parallelogram QRST.

y = 5
Solution:
7y = 5y + 10
7y - 5y = 10
2y = 10
[tex]\frac{2y}{2}[/tex] = [tex]\frac{10}{2}[/tex]
y = 5
Checking:
7y - 5y = 10
7(5) - 5(5) = 10
35 - 25 = 10 ✓
Answer:
5y+10=7y. (reason opposite sides of pam. are equal)
10=7y-5y
10=2y
∴y=5