Answer:
B. -12x
Explanation:
Here are the steps to why B is correct
Multiply the second equation by -4, then add the equations together.
(−2x + 4y = 15)
−4(3x + y = 2)
Becomes:
−2x + 4y = 15
−12x − 4y = −8
Add these equations to eliminate y:
−14x = 7
Then solve −14x = 7 for x:
−14x = 7
-14x/-14 = 7/-14
x = -1/2
Now that we've found x let's plug it back in to solve for y.
Write down an original equation:
−2x + 4y = 15
Substitute -1/2 for x in −2x + 4y = 15:
-2(-1/2) + 4y = 15
4y + 1 = 15(Simplify both sides of the equation)
4y + 1 − 1 = 15 − 1(Subtract 1 to both sides)
4y = 14
4y/4 = 14/4 (Divide both sides by 4)
y = 7/2