What is a possible first step in eliminating a variable in the following system of equations?

x + y = 3
3x – 4y = 23

Choices:

A.Multiply the first equation by –4.
B.Multiply the first equation by 3.
C.Choices 1 and 2.
D.None of the above.

Question

What is a possible first step in eliminating a variable in the following system of equations?

x + y = 3
3x – 4y = 23

Choices:

A.Multiply the first equation by –4.
		B.Multiply the first equation by 3.
		C.Choices 1 and 2.
		D.None of the above.

anonymous · Answer

C

anonymous · Answer

u want to solve only 1 variable

anonymous · Answer

A.
-4x-4y=-12
3x-4y=23

Subtracting the equations eliminates y

B.
3x+3y=9
3x-4y=23

Subtracting the equations eliminates x

So, choices A and B both seem to work.

anonymous · Answer

so the answer is C?