When are is equal to 3 what does 5r plus 1 equal?

Answer 1

With variables, all you have to do is replace any variable with what it is equal to:

Example:

A + B = C

If A = 5 and B = 10

Just replace every A with a 5 (because A = 5)

5 + B = C

Then just replace every B with a 10 (because B = 10)

5 + 10 = C

Then you can solve for C.

5 + 10 = 15

Therefore C = 15

For your Problem, you have:

(5)(r) + 1 = ??? given that r = 3

Replace every r with a 3 (because r = 3)

(5)(3) + 1 = ???

Use your order of operations: PEMDAS, so multiply the two numbers first

15 + 1 = 16

The answer is 5r+1 = 16, when r is equal to 3