3. how many solutions does the system of equations have? (1 point) 3x = -12y + 15 and x + 4y = 5 (a). one (b). two (c). infinitely many (d). none 4. how many solutions does the system of equations have? (1 point) y = 6x + 2 and 3y - 18x = 12 (a). one (b). two (c). infinitely many (d). none 5. how many solutions does the system of equations have? (1 point) x - 3y = 15 and 3x - 9y = 45 (a). one (b). two (c). infinitely many (d). none 6. how many solutions does the system of equations have? (1 point) y - 6x = -3 and 4y - 24x = -16 (a). one (b). two (c). infinitely many (d). none