Guided Practice x
3
7
12
y
5.4
12.6
21.6

For the data in the table, tell whether y varies directly with x. If it does, write an equation for the direct variation.

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.