Kay buys 12 pounds of apples. each pound cost 3$. if she gives the chaser 20$ bill, how much change will she receive

y = x + 1

y = 2x +8

A linear equation is an equation of a straight line, which means that the degree of a linear equation must be 0 or 1 for each of its variables. In this case, the degree of variable y is 1 and the degree of variable x is 1.

The standred form is Ax + By = C. So y = 2x + 8 and y = x + 1 is a linear equation because the degree of a linear equation must be 0 or 1 for each of its variables.