Question

Heidi thinks the rule for the table below is y = x + 3.

Is she correct?
X
-2
-1
0
1
2
y
-7
-4
-1
2
5

Answer 1

Heidi is wrong.

If you substitute the x in y= x + 3 with the x values given at the table, you get different answers than the ones given on the table for the most part.

-2 + 3 equals 1 not -7

-1 + 3 equals 2 not -4

0 + 3 equals 3 not -1

1 + 3 equals 4 not 2

2 + 3 equals 5. This is the y value in the table. But for y= x + 3 to be the rule, the y value in the table and the y value we get from substituting the x value into y= x + 3 would have to be correct every time