Write a Two-Step Equation
Four less than five times a number is equal to 11.
5n - 4 = 11
n = 3
Fifteen more than half a number is 9.
1/2n + 15 = 9
n = -12
Six less than seven times a number is equal to -20.
7n - 6 = -20
n = -2
Amy has saved $725 for a new guitar and lessons. Her guitar costs $475, and guitar lessons are $25 per hour. Determine how many hours of lessons she can afford.
h = number of hours
475 + 25h = 725
h = 10 hours
The cost for a certain music plan is $9.99 per year plus $0.25 per song you download. If you paid $113.74 one year, find the number of songs you downloaded.
s = number of songs
0.25s + 9.99 = 113.74
s = 415 songs