Pablo mixes 3 units white paint and 1 unit black paint to make gray paint. What two equations show the relationship between units of white paint, w, and units of black paint, b? Show your work.

and

Step-by-step explanation:

Represent white paint with w and black with b

Given

When w = 3; b = 1

Required

Determine the two equations

To get a gray paint, the w and b are needed in the following proportion:

-----(1)

Solve for b

Reorder

---- This is an equation

To get another equation,

Recall that

Solve for w

Make w the subject

Hence, the equations that show the relationship between w and b are:

and

b.an increase in a causes b to decrease

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