Question

What is the result of adding these two equations?

4x - 4y = -2

-9x - 4y = -3

Answer 1

(1/13, 15/26)

Explanation:

If you really want to add them without doing anything to them, we get:

4x - 4y = -2

+ -9x - 4y = -3

= -5x - 8y = -6

But I suspect you want to solve for x and y.

In this case, if you want to eliminate and solve for x and y, we will subtract instead to make it easier:

4x - 4y = -2

- -9x - 4y = -3

= 13x + 0y = 1

13x = 1

x = 1/13

Plug x back in to get y:

4x - 4y = -2

4(1/13) - 4y = -2

4/13 - 4y = -2

4y = 30/13

y = 15/26

Answer 2

(1/13, 15/26)

x = 1/13.
y = 15/26