You are simply just plugging in a number value for a variable to be able to solve the equation.
Answer:

Step-by-step explanation:
The distributive property says that the answer of multiplying two numbers is the same as multiplying the first number by the sum or subtraction of two numbers that result in the second number.
What we have to do is to simpligy the ecuation, this mean, making it shorter.
First we take out the common term of the ecuation:
.
By distributive property
then
.
3.14*r^2
Hope it helps you figure them out
To solve this you can multiply the second equation by to get
3x+6y =18
Then you can subtract it by the first equation to get
7y= 14
And get y= 2
Then you plug in y to one of the equations to find that x=2
2 3/4 that is at least the shortest term