solve the equation for y.
-3x-y+9=0
2007-06-26 03:23:12 · 9 answers · asked by I know where u live!! 1 in Science & Mathematics ➔ Mathematics
-3x-y+9=0 add y to both sides
9-3x = y
2007-06-26 03:26:26 · answer #1 · answered by jeremy s 2 · 0⤊ 0⤋
To solve simple linear equations like this...
"Subtract" everything that doesn't have the factor (y) from both sides. If you're solving for some other variable, then put that variable in the parentheses.
Then "divide" both sides by the coefficient of (y)..
Example
4 - 7x - 3y=0... solve for y.
4 and -7x don't have any y factors, so "subtract" them from both sides
-3y = -(4-7x)
Now divide by the coefficient of y... in this case it's -3
y = -(4-7x)/(-3) = (4-7x)/(3)
So...
y = (4-7x)/(3)
If the equation is non-linear, then it's a little more complicated, but the process is pretty much the same.
2007-06-26 03:53:42 · answer #2 · answered by gugliamo00 7 · 0⤊ 0⤋
y= - 3x + 9
2007-06-26 03:31:02 · answer #3 · answered by JJ 4 · 0⤊ 0⤋
-3x-y+9=0
add y to both sides:
-3x-y+9+y=0+y
-3x+9=y or, if you prefer y=-3x+9
2007-06-26 03:28:57 · answer #4 · answered by M K 2 · 0⤊ 0⤋
y = -3x +9
2007-06-26 03:26:57 · answer #5 · answered by miggitymaggz 5 · 0⤊ 0⤋
-3x+y+9=0
-3x+3x+y+9=3x (add 3x to both sides)
y+9=3x
y+9-9=3x-9 (subtract 9 from both sides)
y=3x-9
2007-06-26 03:30:03 · answer #6 · answered by cidyah 7 · 0⤊ 0⤋
-3x + 9 = y
y = - 3x + 9
2007-06-30 01:12:05 · answer #7 · answered by Como 7 · 0⤊ 0⤋
-3x-y+9=0
y=-3x+9. answer
2007-06-26 03:26:46 · answer #8 · answered by Anonymous · 0⤊ 0⤋
it's a line...
2007-06-26 03:25:42 · answer #9 · answered by Anonymous · 0⤊ 0⤋