two variables, X and Y, are in direct proportion.
The table shows corresponding values of X and Y
X 10 35 Q <-- Table
Y 18 P 9.9 <-- Table
Work out the values of P and Q.
+36916 A direct proportion would be something like y = k x where k is a proprtionality constant
from the first set of data points we can see
y = k x
18 = k (10) or k = 1.8
so for the second set of points y = P = (1.8) 35 = 63 so P = 63
for the tird set of data points 9.9 = (1.8) Q Q = 9.9/1.8 = 5.5 so Q = 5.5
