What does the line y= 5x-13y=7 look like horizontal vertical slanted right upwards slanted right downward

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

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?