Question

Assume that y varies directly with

x, then solve.

If y=2when x=, find y when x=1
y =

Answer 1

y = 4

Explanation:

The question is incomplete . if y = 2 when x = ? . x value is suppose to be given at that instance to get the constant of proportionality. Let us assume x was given as 1/2 or 0.5

y varies directly with x . This can be represented mathematically as follows .

y = kx

where k = constant of variation.

recall

y = 2

when = 1/2

Let us get the constant of variation k and later find y when x = 1.

y = kx

2 = 1/2 k

cross multiply

k = 4

Therefore, let us find y when x = 1

y = kx

y = 4 × 1

y = 4

In this case y is therefore equals to 4.