Answer:
7) x = 29 and y = 28
8) x = 5 and y = 7
Explanation:
7)
Parallelogram
So
4x + 2x + 6 = 180
6x + 6 = 180
6x = 174
x = 29
and
3y - 20 + 4y + 4 = 180
7y - 16 = 180
7y = 196
y = 28
8)
x - 1 = 2x - 6
-x = -5
x = 5
3y - 3 = 2y + 4
y = 7
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