3x - 4y = 7

3x + 2y = -5

When the second equation is subtracted from the first, the resulting equation is _____.
@salehgeek

Question

3x - 4y = 7

3x + 2y = -5

When the second equation is subtracted from the first, the resulting equation is _____.
@salehgeek

anonymous · Answer

$3x-4y=$    $7$
$-(3x+3y=-5)$
----------------

anonymous · Answer

its 2y not 3y

anonymous · Answer

Sorry:
     $3x-4y=$  $7$
$-(3x+2y=-5)$
------------------

anonymous · Answer

Solving this will give you $-6y=...$

anonymous · Answer

-6y= -12
-6y= 12

anonymous · Answer

Which one did you get?

anonymous · Answer

-6y= -12

anonymous · Answer

It should be $6y=12$
Can you show how you got your answer?

anonymous · Answer

sorry $-6=12$

anonymous · Answer

3x + 5y = 78

2x - y = 0

The point of intersection of the lines has an x-coordinate of ___.

anonymous · Answer

sorry $-6y=12$

anonymous · Answer

$3x-4y=7$ 
$-3x-2y=5$
------------------
  $0-6y=12$

anonymous · Answer

x + 5y = -2

2x + y = 5

The point of intersection of the lines has a y-coordinate of ___.

anonymous · Answer

We rewrite the first equation in terms of x
$$x=-2-5y$$
Then, we plug the value of x in terms of y into the second formula:
$$2(-2-5y)+y=5$$
Upon solving for y we have:
$$y=-1$$