3x + 7x = 10010x = 100 we combined like terms10x/10 = 100/10 we divide each side by 10x = 10 now we will substitute this value into our two angles to find out exactly how many degrees they each are. 3x..... 3(10) is 30 degrees7x......7(10) is 70 degrees. To check...add up all 3 angles and be sure they equal 180 degrees30 + 70 + 80 = 180180 = 180
