How do you know if a number is rational irrational or not real number

Which of the following describes the graph of y--4x-36 compared to the parent square root function? stretched by a factor of 2, reflected over the x-axis, and translated 9 units right stretched by a factor of 2, reflected over the x-axis, and translated 9 units left stretched by a factor of 2, reflected over the y-axis, and translated 9 units right stretched by a factor of 2, reflected over the y-axis, and translated 9 units left save and exit next submit

Two numbers have a sum of -19. one number is x. what expression represents the other number?

Y=21.95x+10 y=22.45x solve by substitution