SOLUTION: Given: 5x+1=21 Prove: x=4

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Question 796435: Given: 5x+1=21
Prove: x=4
Answer by luke94(89) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there, simple algebra skills are required remember change the side = change the sign..
5x%2B1=21
5x = 21 - 1 (notice + becomes - and vice versa)
5x = 20 (simplified 21-1)
x = 20/5 (notice * becomes / and vice versa)
x = 4 (simplified 20/5)
There is your proof that 5x +1 = 21 gives x = 4