Which equation is equivalent to the first equation of the system and can be used to solve the system using the linear combination method?
a- 5x + 2y = 12
b- 10x + 4y = 6
c- 5x = 4y = 12
d- -10x - 4y = -12
Which answer describes the number of solutions to the system of equations?
a- no solution
b- one solution
c- two solutions
d- infinitely many solutions
