Question

y and x have a proportional relationship, and y = 15 when x = 3. What is the value of x when y = 4?

Answer 1

To get from x to y:
x = 3 ; y = 15
You just multiply 3 * 5 right?

So now if y = 4, to get that, it would be 5 * x
4 = 5x
Divide to get x

Answer 2

so the answer is 5x?

Answer 3

No you need to isolate x
So you need to get rid of the 5 by x
To do that you just divide 4/5 = ?

Answer 4

y and x are proportional to each other, and y varies with x ,so we can say that
y=kx
and when x=3 ,y is 15
so, 15=3k
where we get k=5

now,we have to find the value of x when y is already given.
using the same concept and we have k as well
so, 4=5x
x=4/5=0.8

Answer 5

hope it helps :)