Question

please help!
x y
1 7
2 10
3 13
4 16
what is the equation/expression that could be used to find y?

Answer 1

note that as x increases by 1, y increases by 3. So, the first guess would be

y = 3x

But when x=1, 3x=3, but y=7. So,

y = 3x+4