Use the form y=mx +b for linear equations.Write the equation for the following relation.C = {(x, y): (6, 15), (8, 21), (10, 27), . . .}

I'm not sure if the answer is right, but here you go. y=mx+b  'm' is for gradient of the line. First, calculate the gradient. Let's use (6,15) and (8,21) Gradient, m = [latex]y_{2} [/latex] - [latex] y_{1} [/latex]                     --------------                      [latex] x_{2} [/latex] - [latex] x_{1} [/latex]                                    =  21 - 15     = 6       = 3                      -----------      ----                           8 - 6         2             Therefore, m = 3 . Now let's search 'b' . Let's use (6,15) again. Substitute it into the equation. y=mx+b  15 = 3 (6) + b b = -3 Thus, the equation : y=3x -3