Writing Equations! :) ?

Question

I have to write equations for #1 and #2. What would the equation be?

1. $30 for the first 500 minutes plus $.20 for each additional minute

2. $40 for the first 700 minutes plus $.30 for each additional minute

Answer 1

I forgot how to do math. Guessing but may be wrong

1.) $30(500) + $.20x=?

2.) $40(700) + $.30x=?

Answer 2

1. m=(30)(.20)(1)

2. m=(40)(.30)(1)

Answer 3

1. y=500(30)+.2x

2. y=700(40)+.3x