In the lab, Melissa has two solutions that contain alcohol and is mixing them with each other. She uses 4 times as much Solution A as Solution B. Solution A is 19% alcohol and Solution B is 10% alcohol. How many milliliters of Solution B does she use, if the resulting mixture has 688 milliliters of pure alcohol?

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: