Question 960241
p = cost of a pencil
e = cost of an eraser


p = e + 0.25
8p + 10e = 12.80


Plug in the first equation into the second.


8(e + 0.25) + 10e = 12.80
18e = 12.78
e = 0.71


An eraser costs 71 cents and a pencil costs 96 cents.