SOLUTION: hey i dont unnderstand this and niether do my parents. graphing systems of equations. ok. heres one of my questions. -5x=-21+6y -5x+1y=-84 and i have to find a solution bu

Algebra ->  Graphs -> SOLUTION: hey i dont unnderstand this and niether do my parents. graphing systems of equations. ok. heres one of my questions. -5x=-21+6y -5x+1y=-84 and i have to find a solution bu      Log On


   

Question 136233: hey i dont unnderstand this and niether do my parents.
graphing systems of equations.
ok. heres one of my questions.
-5x=-21+6y
-5x+1y=-84
and i have to find a solution but dont know how
please help if you can thx bye
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
graphing systems of equations.
ok. heres one of my questions.
-5x=-21+6y
-5x+1y=-84
------------------
1st equation:
-5x = -21 + 6y
Solve for "y":
6y = -5x+21
y = (-5/6)x + (7/2)
Find two points on the line:
If x = 0 , y = 7/2
If x = 6 , y = -3/2
Plot those two points and draw a line thru them.
---------------------------
2nd equation:
-5x + y = -84
Solve for "y":
y = 5x - 84
Find two points on the line:
If x = 0 , y = -84
If x = 16, y = -4
Plot those two points and draw a line thru them.
graph%28400%2C300%2C-10%2C20%2C-90%2C10%2C5x-84%2C%28-5%2F6%29x%2B%287%2F2%29%29
------------------------------
Solution: x=15; y=-9
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Cheers,
Stan H.