Answer:
x=15
Step-by-step explanation:
The angle 3x+18 and 8x-3 are supplementary angles, which means they equal 180.
Set the angles equal to 180:
3x+18+8x-3=180
Simplify:
11x+15=180
Subtract 15 from each side
11x=165
Divide by 11 on each side
x=15
Answer:
[tex](3x + 18) + (8x - 3) = 180 \\ 11x + 15 = 180 \\ 11x = 165 \\ x = \frac{165}{11} \\ x = 15 \\ [/tex]