Posted by lil on .
the cost of three markers and two pencils is 1.80
the cost of four markers and six pencils is 2.90
what is the cost of each item?

algebra 
Jen,
3x+4y=1.80
4x+6y=2.90
Do you know how to use elimination? 
algebra 
lil,
uhm no. explain the steps please?

algebra 
Jen,
Ok, so if you make markers "x" and pencils "y", you get
3x+4y=1.80
4x+6y=2.90
Then you use elimination (by figuring out what to multiply one or both equations by to get rid of one of the variables, either x or y).
Multiplying the top equation by 4
and the bottom equation by 3 to eliminate the x's gives us
12x16y=7.2
12x+18y=8.7
Add the equations together
2y=1.5
Divide both sides by 2
y=?
Plug that back into any of your equations to solve for x.
Once you get your answers, feel free to post them if you want them checked. 
algebra 
lil,
thanks so much. do you have time for one more problem ?

algebra 
Jen,
Sure, are you still on?