Question 519795
2 angles are complementary.
That means the 2 angles sum to 90 degrees.
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x = one angle
y = complementary angle
x + y = 90
so
x = 90-y
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x + 1/2y = 72
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substitute for 'x'
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90-y +1/2y = 72
-1/2y = -18
y = 36
.
x = 90-36 = 54
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Does x + 1/2y = 72?
54 + 18 = 72
OK.
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Answer:  The two angles are 54 degrees and 36 degrees.
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Done.