30 points.

consider this system of equations:

2x + 1/4y = 3 ( equation a )
2/3x - y = 6 ( equation b )

the expressions that give the value of y are

a) a - 3b
b) a - (3b/2)
c) 2a - 3b
d) (a/3) + b)

and

a) a + 3b
b) a+ (3b/2)
c) (a/3) - b
d) (a/3) - 2b

the solution for the given system is

a) (27/13, 60/13)
b) (-27/13, 60/13)
c) (27/13, -60/13)
d) (-27/13, -60/13)