Asked by lil

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?
Answered by Jen
3x+4y=1.80
4x+6y=2.90
Do you know how to use elimination?
Answered by lil
uhm no. explain the steps please?
Answered by 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
-12x-16y=-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.
Answered by lil
thanks so much. do you have time for one more problem ?
Answered by Jen
Sure, are you still on?
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