find the constant: x:2 , 6,10 y: 4.2,12.6,21
To find the constant in this situation, we can look at the relationship between the x and y values.
From the given data, we can see that as x increases by 4 (from 2 to 6 to 10), y increases by 8.4 (from 4.2 to 12.6 to 21).
Therefore, the constant is 8.4.