Question 60772
c = cost of chocolate bar
g = cost of a pack of gum
3c + g = 1.75
2c + 4g = 2.00
multiply 1st by 4
and subtract the 2nd
12c + 4g = 7.00
-2c - 4g = -2.00
10c = 5.00
c = .50
so, cost of a chocolate bar is $.50
2(.50) + 4g = 2.00
1.00 + 4g = 2.00
4g = 1.00
g = .25
so, cost of pack of gum is $.25
check
3(.50) + .25 = 1.75
1.50 + .25 = 1.75
OK