Answer:
A and B
Add or subtract
Step-by-step explanation:
Because the absolute values of BOTH numbers attached to "x" and "y" are the same in both equations, you can add or subtract. When you add or subtract equations, to add or subtract each of the terms separately.
Let's try adding the equations:
. 2x + 3y = -5
+ 2x - 3y = 10 3y + (-3y) = 3y - 3y = 0. "y" is eliminated.
. 4x - 0 = 5
. 4x = 5 Only one variable
Let's try subtracting the equations:
. 2x + 3y = -5
- 2x - 3y = 10 2x - 2x = 0. "x" is eliminated.
. 0 + 6y = -15
. 6y = -15 Only one variable
If you multiply the top equation by 2, NEITHER of the numbers with "x" or "y" will be the same in both equation.
Let's try multiplying 2x + 3y = -5 by 2.
2x + 3y = -5 X2 => 4x + 6y = -10
Add the equations:
. 4x + 6y = -10
+ 2x - 3y = 10
. 6x - 3y = 0 None of the variables are eliminated and we can't solve for any variable.
