Question

If y varies directly with x, and y = 6 when
x = 9, what is the value of x when y = 7
I need Help

Answer 1

y = kx

Plug in what we know:

6 = 9k

Divide 9 to both sides:

6/9 = k

k = 2/3

Okay, now let's plug in our constant with y = 7.

y = kx

7 = 2/3x

Divide 2/3 to both sides or multiply by its reciprocal, 3/2.

So what's 3/2 * 7?

Answer 2

10.5?

Answer 3

Yes, that's our answer.

x is 10.5 when y is 7.

Answer 4

Ok thanks @iGreen.