If y is directly proportional to

Question

x and y = 65 when x = 33, find y if x = 44
. (Round off your answer to the nearest hundredth.)

Answer 1

y1/x1 = y2/x2

65/33 = y2/44
y2 = 44(65/33) = 260/3 or 86 2/3 = appr 86.67

or

"If y is directly proportional to x"
means y = kx
if y = 65, x = 33
65 = 33k
k = 65/33

y = (65/33)x
when x = 44
y = (65/33)(44) = appr 86.67