Which equation has a constant of proportionality equal to 1

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Need solving this second acceleration problem.

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)