Question

Which ones are supplementary and the ones that are, what does x equal?

Answer 1

9 and 10 are supplementary

Explanation:

9. (20x + 30) + (15x + 10) = 180

35x + 40 = 180

35x = 140

x= 4

10. (2x + 10) + (11x + 14) = 180

13x + 24 = 180

13x = 156

x = 12