use elimination:
please help and show steps so i can understand!
2.5x+2y=10.7
-2.5x+2y=12.9

Question

use elimination:
please help and show steps so i can understand!
2.5x+2y=10.7
-2.5x+2y=12.9

superdavesuper · Answer

Elimination means to eliminate a variable in order to solve a prob.

In this case, add the two equations together and see what happens plz

anonymous · Answer

yeah nevermind i figured this one out. lol sorry.

anonymous · Answer

well wait actually, i know you have to subtract the y but idk what next

superdavesuper · Answer

OK after subtraction wats left on the left n right of the = sign?

anonymous · Answer

and i wrote the problem wrong at first this is the right one:
2.5x+y=10.7
-2.5x+2y=12.9

superdavesuper · Answer

Actually a simpler way is just add them together n see wats left.  try it :)

anonymous · Answer

i don't know… 3y=23.6?

superdavesuper · Answer

Yup so y equals to.....?

anonymous · Answer

7.8?

superdavesuper · Answer

i got 7.9 but close enough lol

now solve for x n u are DONE :)

anonymous · Answer

well I'm not sure how to do that.

superdavesuper · Answer

put y=7.9 back into either 1 of da eqn

anonymous · Answer

ok so,
2.5x+7.9=10.7
       -7.9    -7.9
2.5x=2.8
_________
2.5    2.5
x=1.12
correct?

agent0smith · Answer

^yep.