solve the system of equations by eliminating the y variable: 9x+ 4y= -14 -2x+y=5

Question

solve the system of equations by eliminating the y variable: 9x+ 4y= -14     -2x+y=5

anonymous · Answer

Multiply all the terms in "-2x + y = 5" by -4

Giving 8x - 4y = -20, then add both equations
         9x + 4y = -14
          ------------
         17x = - 34
             x = -2             and back solve for y

          8x - 4(-2) = -20
           8x =-20 - 8
             x = -7/2

jhonyy9 · Answer

ok ?

anonymous · Answer

the wrong answer

anonymous · Answer

Plug the answer for x BACK into the equation. He plugged the x value into the y-variables.

anonymous · Answer

It should be: 8(-2) - 4y= -20  and continue to solve

anonymous · Answer

y=1

anonymous · Answer

Thanks Sam30317, that's a little more helpful than, " the wrong answer"

anonymous · Answer

and correct

anonymous · Answer

Lol!

anonymous · Answer

Do u understand how I got "1"?

jhonyy9 · Answer

9x+4y=-14
-2x+y=5   multiply by -4 and assum to first

9x+4y=-14
8x-4y=-20
-----------
17x  0 =-34
x=-2

-2(-2)+y=5
4+y=5
y=1

jhonyy9 · Answer

hope this is right and understandably sure

good luck

bye

anonymous · Answer

When you plug in BOTH variables for either equation, you get -20 or -14