Question

2. Suppose that y varies directly with x and inversely with z, and y = 18 when x = 15 and z = 5. Write the equation that models the relationship. Then find y when x = 21 and z = 7. (1 point) Connections help????

Answer 1

for variation problems, you must first find the constant.

the formula for direct variation is Y = KX
formula for inverse variation is Y = k/Z

so combine the two based on your problem

Y = (KX)/Z

plug in given values for y x and z to find k

tell me what K is

Answer 2

k=6?

Answer 3

correct

Answer 4

now using that value of k

use the same formula and solve for Y based on that x = 21 and z = 7
what did you get?

Answer 5

y=18?

Answer 6

You are absolutely right!!!! Remeber those formulas and you can do any variation problem

Answer 7

thank you so much