Given the system of equations presented here:
4x + y = 4
2x + 6y = 24
which action creates an equivalent system that will eliminate one variable when they are combined?
a. multiply the first equation by -4 to get -16x - 4y = -16.
b. multiply the second equation by -4 to get - 8x - 24y = -96.
c. multiply the first equation by -2 to get -8x - 2y = -8.
d. multiply the second equation by -2 to get - 4x - 12y = -48.