Answer:
4) smaller number is 9, larger number is 12
13) 38.45=5m+8.5
m=5.99
Step-by-step explanation:
x+y=21 the sum of two numbers is 21
x-3=.5y the smaller number is 3 more than half the larger number
multiply both sides by 2 and you get 2x-6=y
plug that equation into the first equation and you get x+2x-6=21
simplifying you get 3x-6=21 add 6 to both sides and you get 3x=27
x=9 so the smaller number is 9 then you plug that back into the first equation and get y=12
let m be the cost of 1 movie and c be the cost of the cd
38.45=5m+c
38.45=5m+8.5 this is the equation you use
subtract 8.5 from both sides and you get 29.95=5m
divide both sides by 5
5.99=m the answer
