Metthew's cell phone plan charges $15 a monnth and 25 cents for every minute. if his bill for one month is $30.75,how many minutes did he use? write and solve the equation.

15+ m*25= 30.75

30.75-15=15.75

15.75/25=.63

He used 63 minutes!!

Hope I helped:D 

So the one time payment is $15, and the one with variable is $0.25, so the equation is 15+0.25X=30.75
in order to find out how many minutes he used, first subtract 15 from both sides, now ur left with:
0.25X=15.75
now to isolate the variable, divide 0.25 from both sides, 0.25 divided by 0.25 cancel out leaving u with the variable. divide 15.75 by 0.25
X=63
So Matthew used 63 minutes.