Question

If y is 5 when x is 2.5 and y varies directly with x, find y when x is 10.

5
7.5
12.5
20

Answer 1

Remember you can write any directly varying function as y= k*x where k is a constant.

So for this you would take your given pair of values and plug them into the equation to find k.
then you would use this equation with the k you just found to find Y at any value of X

Answer 2

y = kx

Plug in what we know:

5 = 2.5k

Divide 2.5 to both sides, what do yo uget?

Answer 3

*you

Answer 4

2?