Answer
Cost of a crayon = $1.19
Cost of a marker = $0.39
Step-by-step explanation
Let the cost of a crayon be c
Let the cost of a marker be m
Jenny bought 4 crayons and 5 markers for $6.71
4c + 5m = 6.71 (equation 1)
Gary bought 5 crayons and 3 markers for $7.12
5c + 3m = 7.12 (equation 2)
We can then write the two equations together and solve
4c + 5m = 6.71
5c + 3m = 7.12
Solving simultaneously
c = $1.19
m = $0.39
Hope this Helps!!!