For problem #1: y = 5x
To figure out what happens when x doubles, choose a beginning value for x (perhaps choose 10) and put this number into
the formula: y = 5(10) = 50 ---> So when we start with 10 for x, we end with 50 for y.
Now, to figure out what happens to y when we double x, let's double our value for x (now it's 20) and put this
number into the formula: y = 5(20) = 100 ---> So when x is 20, we end with 100 for y.
Now, let's compare our final value of y (100) with our first value of y (50).
Is 100, 50 multiplied by 2?
Or, is 100, 50 multiplied by 5?
Or, is 100, 50 divided by 2?
Or, is 100, 50 divided by 5?