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In a linear function, you always add the same number to the y to get the next y. See in that table the first y is 7. Add 2 to get to 9. So to be linear, you need to add 2 to get each other y. So, 7, 9, 11, 13, that's how you know it's a linear function because you add 2 to get the next y term (the fancy term is a common difference, but the idea is simple!)
you just have to subtract the y and then the x and divide them by each other
like this this the y = 9-7=2 and then the x = 4-2 =2 you divide what you got for x and y 2/2 =1 and do the same for the other and it be the same number for it to be linear function
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