Posted by Molly on Thursday, February 7, 2013 at 7:46pm.
My family went to starbucks. We ordered 3 drinks. My daughter's drink was .90 cents less than my drink and my sons drink was $2.20 more than my drink. The total bill was $12.90. How much was each drink? Use algebra.
k so i did this: x+ (x.90) + (x+2.20) = 12.90
how do you solve for x though... i tried doing this but i just don't understand pleese help

Math 9  Ms. Sue, Thursday, February 7, 2013 at 7:57pm
Let x = the parent's drink.
x+ (x.90) + (x+2.20) = 12.90
Combine like terms:
3x + 1.30 = 12.90
3x = 12.90  1.30
3x = 11.60
x = 3.87
3.87 + 2.97 + 6.07 
Math 9  Molly, Thursday, February 7, 2013 at 7:59pm
omg thank you, i was trying this too thanx:)

Math 9  Ms. Sue, Thursday, February 7, 2013 at 8:07pm
You're very welcome.