Answer:
White paper = 24 reams
Yellow paper = 76 reams
Explanation:
let w = white paper and y = yellow paper
5y + 6.5w = $536 Eq.1
y + w = 100 Eq.2
multiply eq.2 by -5 and add to eq.1 to eliminate the y
5y + 6.5w = 536
-5y - 5w = -500
______________
1.5w = 36
w = 24
Use any of the equations and substitute w = 24
y + w = 100
y + 24 = 100
y = 76