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