What’s the slope for this graph ??

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

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

What are the solutions of the system? y = x^2 + 2x +3y = 4x - 2a. (-1, -6) and (-3, -14)b. (-1, 10) and (3, -6)c. no solutiond. (-1, -6) and (3, 10)