Which of the equations listed below are linear equations?

1: c= 2pir
2: a= pir^2
3: v= 4/3pir^3

a equation 1 only
b equation 2 only
c equations 1 and 3

1.

Step-by-step explanation:

We know that a linear equation is a particular type of equation .

The given equations :

Here , variable = r (radius)

Since , the variable has exponent =1 , therefore it is a linear equation.

Here , variable = r (radius)

Since , the variable has exponent =2 , therefore it is not a linear equation.

Here , variable = r (radius)

Since , the variable has exponent =3 , therefore it is not a linear equation.

Hence , the correct answer is .

the correct answer is you spend $55.78 more in a brand store that buy ing in a normal store.

step-by-step explanation:

brand = spend   $ 135.85 total

store = spend $80.07 total

the solution is the point

step-by-step explanation:

we have

> equation a

> equation b

adds equation a and equation b

substitute the value of x in equation b to find the value of y

the solution is the point