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ok, lets eliminate y, and find x first:
to eliminate y lets multiply 1st eq by 2 and 2nd eq by -5, to make both Ys cancel each other out once subtracted, so we will have:
so now we have to subtract coresponding members in both eqs:
now divide both sides by a 45 to find x
to find y just substitute it into any of the equations:
y = -1.28889
y = -1.289
now lets see if I was correct, by substituting the values into any eq:
so I was right and the answers are correct
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that doesn't work for the other equation...you messed up somewhere on top
:/ sorry if I did
but works for me
you didn't cancel out y because you had positive 10y on both equations instead of one positive and one negative so that only gave you the right answer for one equation
ok, so how do I do it?
do the first equation the same but instead of multiplying second equation by -5 multiply it by 5 so you get
10x + 10y = -14
35x - 10y = 65
this way y really is eliminated then you have
45x = 51 so x = 51/45 which is approximately 1.1333....
plug into either equation and solve
7(1.1333) - 2y = 13
7.9331 -2y = 13
after solving for y you get y = -2.53345
now check those two values in both equations