Hello! Remember that the sum of triangle angles are 180 degree. Based on this we can make a equation for number 1. (15x+1)+(6x+5)+(4x-1)=180 25x+5=175 25x=175 x=7 For number 2 we can solve the third angle of the two traingles using the method above. 180-80-53=47 180-50-62=68 With the two angle we can solve the third angle of the small triangle which is 180-47-68=75. See that x and 75 have the same angle because they are all across from two lines so that x=75. Have a great day!
