Developing Proof: Fill in the reasons for this algebraic proof. Given: 5x + 1 = 21 Prove: x = 41) 5x + 1 = 21 Give the reasons for the following steps in the proof 1) 5x + 1 = 21 1) a. given 2) 5x = 20 2) b. ? 3) x = 4 3) c. ? ... number 1 is provided ... the given ... In other words how do you get from step 1 to 2 and step 2 to 3? *

21 = 21

Step-by-step explanation:

5x + 1 = 21

-1           -1

5x = 20

__    __

5        5

x = 4

5x + 1 = 21           First substitute x for 4

5(4) + 1 = 21        Then continue to solve the problem to get the proof

20 + 1 = 21          

21 = 21

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step-by-step explanation: