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March 5, 2015

March 5, 2015

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

- Math -
**jai**, Thursday, October 28, 2010 at 9:35pmfirst, 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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