Answer:
x = 16
y = 140
Step-by-step explanation:
Since angles on a straight line add to 180°,
(8x + 12) + (3x-8) = 180
8x + 3x + 12 - 8 = 180
11x + 4 = 180
11x = 176
x = 16
Due to the Alternate Interior Angles Theorem,
y = 8x + 12
Substituting 'x=16' into 'y=8x+12':
y = 8(16) + 12
= 128 + 12
= 140
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