Question

The value of y is directly proportional to the value of x. If y = 288 when x = 32. What is the value of y when x = 25?

Algebra 1

Answer 1

y = 225

Explanation:

since y and x are directly proportional the equation relating them is

y = kx ← k is the constant of proportionality

to find k use the given condition y = 288 when x = 32

k =
`(y)/(x)` =
`(288)/(32)` = 9

y = 9x ← is the equation of proportionality

when x = 25, then

y = 9 × 25 = 225