The lines described by y = (a + 12) x + 3 and y = 4ax are parallel. what is the value of a

The lines are parallel if and only if the values of their slopes are equal. In a standard form of the equation of the line, the slope is the numerical coefficient of x. Given this condition, we determine the value of a by equation a + 12 and 4a.

Slope = a + 12 = 4a

The value of a from the equation is 4.

Answer: 4