How do you determine the scale factor of dilation?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2