Two angles with measures (5x + 7) and (15x - 7) are supplementary. What is the value of x? a. x = 9 c. x = 42 b. x = 18 d. x = 15

Original conversation

User: Two angles with measures (5x + 7) and (15x - 7) are supplementary. What is the value of x?
a. x = 9 c. x = 42
b. x = 18 d. x = 15

Weegy: 5x^2=15x
Move the 15x over to the other side. [ Now you have:
5x^2 - 15x = 0
Does this look more familiar? More like a quadratic? Now try factoring out the monomial, which is in this case 5x.
5x (x - 3) = 0
What will make 5x = 0? 0.
What will make x-3 = 0? 3.
So your solution set is...
{0, 3} ] keath1219|Points 171|

(5x + 7) + (15x - 7) = 180; 20x = 180; x = 180/20; x = 9

Two angles with measures (5x + 7) and (15x - 7) are supplementary, the value of x is x = 9. (5(9) + 7) + (15(9)- 7) = 180; 45 + 7 + 135 - 7 = 180; 52 + 128 = 180; 180 = 180

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