Question 285492: an office supply store sells 7 writing tablets and 4 pens for 6.40. also 2 tablets and 19 pens cost 5.40 find the price of each Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! Let the tablets be x
and the pens be y
7x+4y=6.4----------- Multiply by 2
2x+19y=5.4-----------Multiply by 7
14x+8y=12.8
14x+133y=37.8
(14x+8y)-(14x-133)=12.8-37.8
8y+133=25+133
141y=158
y=158/141
=1.12 price of pens
14x+8*1.12= 12.8
14x=12.8-8.96
14x=3.84
x=3.84/14
x=0.27 price of tablets
