I need help.. lol
Solve this system of equations using any method.

3x – y = 4
2x + y = 11

A (3, 8)
B (3, 5)
C (5, 1)
D (5, 11)

Question

I need help.. lol
Solve this system of equations using any method.

3x – y = 4
2x + y = 11

      A  (3, 8)
      B  (3, 5)
      C (5, 1)
      D (5, 11)

solomonzelman · Answer

I would suggest elimination, add the equations to each other to find x.

anonymous · Answer

yea me to plug in the numbers

the_fizicx99 · Answer

5x = 15

Solve for x

solomonzelman · Answer

No need plugging in, do what I said, and plug in what you get for x instead of x to solve for y.

Do you know how tHe_FiZiCx99  got   5x=15?

shylovesyou11 · Answer

I have no clue.. lol

solomonzelman · Answer

OK.
add the equations like this
     3x – y = 4
+  
    2x + y = 11
-------------
   5x  + 0y = 15

5x=15
x=3


so far so good?

shylovesyou11 · Answer

Ohhhhhhh, Thats how he got it.. And yes

solomonzelman · Answer

Ok, can you solve for y?

shylovesyou11 · Answer

Sooooo the answer would be 3,8 right?

solomonzelman · Answer

No.

solomonzelman · Answer

Plug in 3 for x.

3x – y = 4     -->   3(3)-y=4  ---> 9-y=4 --> y=5
2x + y = 11 --> 2(3)+y=11 ---> 6+y=11 --> y=5
So also verified that in both equation it's (3,5)

shylovesyou11 · Answer

Ohhhhhhh, I put in 8.. Well, Thank you!!! ^_^

solomonzelman · Answer

You welcome!