For the graphing if for example it says (3,-9) then you start at the very middle called the origin. Then go to the right 3.(this is called the x-axis) then go down 9 (this is the y axis) stop there and put you point. I hope this kinda helps explain this to you better :/
35 + 52 + 3(x + 2) = 180 87 + 3x + 6 = 180 ( add the like terms and use distributive property) 93 + 3x = 180 -93 -93 3x = 87 ÷3 ÷3 x = 29 ( the sum of all triangle angles is 180)
