So you have 6x-20 and 4x+30. These angles are perpendicular to each other, meaning together they equal 180 degrees. To solve for this equation add both of the equations together equal to 180. 6x-20+4x+30=180 Now subtract: 30-20= 10 so 180-10= 170 Next add 6x to 4x= 10x So 170=10x X=17 Now we use substitution to simplify our answers into numerical form: 6(17)-20= 82 this is for 6x-20 4(17)+30= 98 this is for 4x+30 Hope that helps! :)