Question

If you know anything about combining equations, specifically subtracting, can you please help me :)

Answer 1

5x + 2y = - 2

Explanation:

If you're just adding the 2 equations to get a final equation, then all you need to do is add like terms (like -2x and -7x, or y and 3y).

-2x + y = 0

- (-7x + 3y = 2)

_________

5x + 2y = - 2

Answer 2

5x - 2y = -2

Explanation:

When subtracting one equation from the other, we are essentially just subtracting the left side of the second equation from the left side of the first equation and doing the same thing with the two right sides.

Here, we are subtracting (-7x + 3y) from (-2x + y):

(-2x + y) - (-7x + 3y)

Let's get rid of these parentheses. Remember that when we have a subtraction sign before a parentheses, we need to distribute a -1 to each term within those parentheses:

(-2x + y) - (-7x + 3y) = -2x + y + 7x - 3y = -2x + 7x + y - 3y = 5x - 2y

Now on the right side, we're subtracting 2 from 0:

0 - 2 = -2

Put it all together:

5x - 2y = -2

Hope this helps!