Let y equal number of pushups a day. When x = 1, y = 8. When x = 2, y = 10. 10 is a factor of 30. Multiply y by 3. However, since x increases by 1 when y increases by 2, multiply x by 6 (2*3). That equals 12. Therefore, when x = 12, y = 30.
A <em>constant</em> is a number or term that does not change. Usually it is the term that <em>does not </em>have a variable. In the equation, 6 cannot change. Therefore, the constant is 6