Question

What is the equation of direct variation, given that y varies directly with x.

y is 10 when x is 2

Answer 1

y =5x

Answer 2

This helped me.

If y varies directly as x, and y = 8 when x = 12, find k and write an equation that expresses this variation.

Plan of Attack:

Plug the given values into the equation y = kx.

Solve for k.

Then replace k with its value in the equation y = kx.

Step-by-Step:

Start with our standard equation: y = kx

Insert our known values: 8 = k*12

Divide both sides by 12 to find k: 8/12 = k

2/3 = k

Next: Go back to y = kx and replace k with 2/3.

Result:

y = (2/3)x

Answer 3

thanks!(: