Answer:
∠MON = 99 degrees
Step-by-step explanation:
Add both equations to equal 180 degrees since they are supplementary angles.
8x - 13 + 7x - 17 = 180 Combine like terms
15x - 30 = 180
+ 30 + 30 Add 30 to both sides
15x = 210 Divide both sides by 15
x = 14
Plug this into the equation for ∠MON
∠MON = 8(14) - 13
∠MON = 112 - 13
∠MON = 99 degrees
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