Answer:
blue marble = 5(2) = 10
white marble = 5(2) - 2 = 10 - 2 = 8
Step-by-step explanation:
let m be the number of blue marbles
blue marble = 5m
white marble = 5m - 2
total number of marble = 18
total number of marble = blue marble + white marble
18 = 5m + 5m - 2
18 = 10m - 2
18 + 2 = 10m
20 = 10m
2 = m
