Question

Which of these strategies would eliminate a variable in the system of equations?

{
6
�
+
5
�
=
1
6
�
−
5
�
=
7
⎩
⎪
⎪
⎨
⎪
⎪
⎧
​

6x+5y=1
6x−5y=7
​

Choose all answers that apply:
Choose all answers that apply:

(Choice A)
A
Subtract the bottom equation from the top equation.

(Choice B)
B
Add the equations.

(Choice C)
C
Multiply the top equation by
7
77, then subtract the bottom equation from the top equation.

Answer 1

B

Explanation:

If both signs are the same (++,--), then you subtract.

If the two signs are different(+-,-+), then you add.