/_1 and /_2 are supplementary angles. m/_1 is 4y+7 and m/_2 is 9y+4. What is m/_2?

First we should define supplementary angles.
Supplementary angles are angles that add up to 180 degrees.
Since 1 and 2 are supplementary and we know their values we just set them equal to 180 degrees
##(4y + 7) + (9y + 4) = 180##
Now just solve for one variable
##13y + 11 = 180##
##13y = 169##
##y = 13##
Now the question asks for m<2 which is ##9y + 4## So we just plug in ##9*13 + 4 = 121## So m<2 is 121