Question 57521
let the chocolate bars be X
Let gum be Y

form 2 linear equations to find for x and y,
3X+Y=1.75
2X+4Y=2.00

In this case it would be easier and more simple to solve for x first, 
multiply the first equation by 4, then subtract the equations to form a single linear equation

12X+4Y=7.00
2x+4Y=2.00
_____________
10X=5

divide out 10 to isolate x

X=0.50

substitute x into the first equation to solve for y,

3(.50)+Y=1.75
1.50+y=1.75
Y=.25


So a chocolate bar costs $0.50 and a pack of gum is $0.25