# Jointly and cube power

If y varies jointly as x and the cube of z and y=16 when x=4 and z=2, find an equation representing this relationship.

a. y=xz

b. y = 2xz³

c.y = 2kx/z³

d.y = xz³/2

a. y=xz

b. y = 2xz³

c.y = 2kx/z³

d.y = xz³/2

## Correct answer:

### You need to know the following knowledge to solve this word math problem:

**algebra**- expression of a variable from the formula
**arithmetic**- third power
**basic functions**- direct proportionality
- functions

### Units of physical quantities:

### Grade of the word problem:

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