Let x and y be two supplementary angles, where the measure of x is three times the measure of y. Which system of equations below could be used to find the measure of the two angles? A. x + y = 180
x = y + 3

B. x + y = 180
y = 3x

C. x + y = 180
y = x + 3

D. x + y = 180
x = 3y

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: