the cost of 3 makers and 2 pencils is $1.80. The cost of 4 markers and 6 pencils is $2.90. What is the cost of each item?
2 answers
The cost of 3 markers and 2 pencils is $1.80, which is $.36 cent each, and The cost of 4 markers and 6 pencils is $2.90 which is $.29 cent each.
3m+2p=1.8 (qeuation A)
4m+6p=2.9 (equation B)
"equation A" times "3":
9m+6p=5.4 (equation A')
"equation A'" - "equation B":
5m=2.5
[m=0.5]
substitude "m=0.5" into "equation A":
3(0.5)+2p=1.8
1.5+2p=1.8
2p=0.3
[p=0.15]
4m+6p=2.9 (equation B)
"equation A" times "3":
9m+6p=5.4 (equation A')
"equation A'" - "equation B":
5m=2.5
[m=0.5]
substitude "m=0.5" into "equation A":
3(0.5)+2p=1.8
1.5+2p=1.8
2p=0.3
[p=0.15]
1 answer