Explanation:
with the y= 4x +1
they find the first column by replacing x in the function by 0
meaning if x= 0 then y=4(0) + 1 so y=1
for the second column if x =2 then y= 4(2) +1 so y= 9
for the 3rd one if x =4 then y = 4(4)+1 so y = 17
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