Question 203699
Supplemental  means  that  the  sum  of  the  2  angles  is  180 degrees
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If  one  angle  is  "x" ,,,the  other  angle  is "180-x"
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ratio = x/(180-x) = 7/8
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cross  multiply
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8x = 7*180 - 7x
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15x = 1260
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x= 84
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(180-x) = 180-84 = 96
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check,,ratio 84/96 = 7/8,,,,ok
,,,,,96 - 84 = 180,,,ok