Ireally need with this short math problem, plz someone me out

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)