*Given Total number of bills - 15 Total value of the bills - $47 Bills - $1 and $5
*Solution Let: x - number of $1 bills y - number of $5 bills
1. The total number of bills comprising of $1 and $5 bills is 15. Thus,
x + y = 15 (EQUATION 1)
2. The total value of the bills is $47. Thus,
$1 (x) + $5 (y) = $47 (EQUATION 2)
3. There are 2 ways to solve this (system of linear equations) mathematically. You can use the elimination method or the substitution method. Using the elimination method to eliminate the variable x... (subtract Equation 1 from Equation 2)
1x + 5y = 47 _ <u> x + y = 15</u> 0 + 4y = 32
4. Thus, the value of y, which is the number of $5 bills is,
Y=mx+b m=slope b=y intercept we are given (3,-1) one solution is x=3 and y=-1 or when x=3 then y=-1 also slope=2 so y=2x+b subsitue 3 for x and -1 for y and solve for b -1=2(3)+b -1=6+b subtract 6 -7=b