Could you please check over these for me? ASAP !!? 10 pts

Select the best possible first step to solving the system by first eliminating the x variable.
x - 3y = 12
2x + 5y = 2 (1 points)
A) Multiply the first equation by 2.
B) Multiply the second equation by 2.
C) Multiply the first equation by -2. <-----
D) Multiply the second equation by -2.


If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation.
x + 2y = 4
x - 5y = 11 (1 points)
A) x - 5(2y + 4) = 11
B) x - 5(-2y + 4) = 11<-----
C) (2y + 4) - 5y = 11
D) (-2y + 4) - 5y = 11

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation.
-x + 5y = 1
2x + 4y = -4 (1 points)
A) 2(5y - 1) + 4y = -4 <-----
B) 2(-5y + 1) + 4y = -4
C) 2x + 4(-5y + 1) = -4
D) 2x + 4(5y - 1) = -4


I am really confused >.
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