Posted by **Sunny** on Thursday, October 28, 2010 at 8:21pm.

A girl earns $6.00 an hour when she works Monday through Friday and $9.00 an hour on Saturday. Last week, her salary was $273 for 42 hours of work. How many hours did she work on Saturday?

- Math -
**jai**, Thursday, October 28, 2010 at 9:35pm
first, represent unknowns with variables:

let x = number of hours she worked for monday-friday

let y = number of hours she worked for saturday

set up equation according to conditions given:

(1) x + y = 42

(2) 6x + 9y = 273

there are many ways to solve for this,, if we use substitution method,,

choose an equation (in this case, equation (1)), then express one of the variables in terms of the other,, thus we express x in terms of y:

x + y = 42

x = 42 - y

now we substitute this to equation (2):

6x + 9y = 273

6(42-y) + 9y = 273

now you solve for y.

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