Question

If xx and yy vary directly and yy is 88 when xx is 11, find yy when xx is 7.

a) 56
b) 64
c) 48
d) 52

Answer 1

To find yy when xx is 7, set up a proportion using the given information and solve for yy. yy = 56. Hence, a) is correct.

Step-by-step explanation:

To find yy when xx is 7, we need to determine the constant of variation between xx and yy. We can do this by setting up a proportion using the given information. Since xx and yy vary directly, the proportion can be written as:

xx / yy = (11 / 88) = (7 / yy)

Cross multiplying, we get:

11yy = 7 * 88

Solving for yy, we have:

yy = (7 * 88) / 11

yy = 56