L bought backpack, 5 binders for $56.09.... find uncle's $$

[cll]

Laura bought a backpack and 5 binders for $56.09 and mindy bought 2 backpacks and 3 binders for $73.96 thier uncle needs to buy 4 backpacks and one binder How much will it cost

 

[cll]

Re: word problem

please help i know i need to find the cost of the back pack but i am not sure how to go about it

 

[Mrspi]

Re: word problem

Laura bought a backpack and 5 binders for $56.09 and mindy bought 2 backpacks and 3 binders for $73.96 thier uncle needs to buy 4 backpacks and one binder How much will it cost

First of all, NAME THINGS:

let x = cost of a backpack
let y = cost of a binder

Laura bought 1 backpack and 5 binders for $56.09
1x + 5y = $56.09

Mindy bought 2 backpacks and 3 binders for $73.96
2x + 3y = $73.96

So, you have two equations in two variables:

1x + 5y = 56.09
2x + 3y = 73.96

Solve that system by your favorite method. When you know the value of x and the value of y, you should be able to evaluate the uncle's cost, which is
4x + 1y

 

[cll]

Re: word problem

im sorry i got this far i dont know how to solve with multiple variables ie x and y

 

[Denis]

Re: word problem

Well if that's the case, see your teacher: we can't teach here.

 

[Deleted member 4993]

Re: word problem

im sorry i got this far i dont know how to solve with multiple variables ie x and y

go to:

http://www.purplemath.com/modules/systlin4.htm

for a quick refresher with examples.