Solve the system of equations.

3x – 4y = 25
3x + 2y = 1
A.
(1, –1)
B.
(3, –4)
C.
(–3, –9)
D.
(7, –1)

Question

Solve the system of equations.

3x – 4y = 25
3x + 2y = 1
A.
(1, –1)
B.
(3, –4)
C.
(–3, –9)
D.
(7, –1)

solomonzelman · Answer

subtract  the second equation FROM the first

anonymous · Answer

WHICH ONE

solomonzelman · Answer

First - Second

anonymous · Answer

I came up with 1x + 2y = 24

solomonzelman · Answer

Subtract each thing (x, y, and constants - (numbers that aren't variables like 1,2,3....)     )
separately.


    3x                   – 4y               = 25

-

    3x                   + 2y               = 1
    --------------------------
-3x - 3x         -4y - 2y              =  25 - 1
 
    0x                  -6y                  = 24



SO FAR SO GOOD?

anonymous · Answer

so now I solve it from here? 
0x + -6y = 24

solomonzelman · Answer

yes. 
and

0x + -6y = 24   is just same as    -6y = 24

1)   Solve for y.
2)   plug in the result for y into any of the ORIGINAL equations
3)   Solve for x

4)  write the answer as (x,y)    where x is the x-value you get AND y, is the y-value you get.

anonymous · Answer

i came up with B (3,-4)