60/45 = $0.75
It costs $0.75 to make each valentine so if they were sold for 75 cents then that would result in a profit of zero if all the valentines were sold.
Answer:
Each pencil costs $0.07 and each eraser costs $0.03
Step-by-step explanation:
System of linear equations
It refers to the study of systems when n variables are related in m linear equations, each one is not independent from the others. Solving such systems can be done following very diverse approaches.
Let p=the price of each pencil while e is the price each eraser
Julio bought 4 pencils and 3 erasers, spending

David bought 3 pencils and 4 erasers, spending

The system of equations is written in the form

We'll solve it by reduction. Multiplying the first equation by -3 and the second by 4:

Adding both equations:
7e=0.21
e=0.03
Multiplying the first one by -4 and the second by 3

Adding both equations:
-7p=-0.49
p=0.07
Solution: Each pencil costs $0.07 and each eraser costs $0.03
The appropriate formula for the accumulated amount (A) for a given principal (P), interest rate (r), and time period (t) is ...
... A = P·e^(rt)
Filling in the given numbers and doing the arithmetic, we get
... A = $25,000·e^(.043·8) ≈ $35,264.46
6+9=15
y+9=x
x=30
y+9=30
y=21
I think none of these are right. It's Y=-5/3x +4/3