Final answer:
To find the proportional value of yy for xx equal to 7, we first determine the constant of proportionality from the given values, yielding a result of yy being 35 when xx is 7.
Step-by-step explanation:
If xx and yy are in direct proportion and yy is 60 when xx is 12, we start by expressing this relationship with the equation:
yy = k * xx
where k is the constant of proportionality. To find k, we plug in the values given:
60 = k * 12
From this, we can solve for k:
k = 60 / 12
k = 5
Now that we have the constant of proportionality, we can find yy when xx is 7:
yy = 5 * 7
yy = 35
Therefore, when xx is 7, yy will be 35.