Please Help! Hurry! (I have 2 simple questions)

1.) Marcy concludes that the following system of equations has one solution.
y = 3x + 6
y = -2x + 10
Which characteristic of the equations did she use to reach this conclusion?
A. They have different slopes.
B. They have the same two variables.
C. They have y on the same side of the equation.
D. They have the same slope, but different y-intercepts.

2.) Which system of equations has no solution?

A.) x + y = -6
x + y = 12

B.) y= 2x + 5
y= -3x + 1

C.) y = 4x - 8
y = 2x - -4

D.) -5x + y = 7
x + 3y = 5