posted by cody on .
Rachael bought 12 pencils and 7 markers for $5.36, and later bought 8 pencils and 5 markers for $3.68. Find the cost of each pencil and marker.
Let x = cost of pencils and y = cost of markers.
12x + 7y = 5.36
8x + 5y = 3.68
Multiply second equation by 1.5.
12x + 7.5y = 5.52
Subtract first equation from modified second equation.
.5y = .16
y = .32
Insert value of y into either equation to find x. Then put both values in the other equation to check your answers.