Please Help Me With This

Keiko is walking. The number of calories she has burned varies directly with the number of minutes she has walked. See the graph below.

How many minutes does Keiko walk per calorie burned?

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?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Do,h = (7, 9) (14, 18) the scale factor is