Solve the equation for y. - 2x - y + 9 = 0
A. y = 2x + 9
B. y = 2x - 9
C. y = -9x + 2
D. y = 9 - 2x
2007-07-27 04:57:52 · 9 answers · asked by whatever 1 in Science & Mathematics ➔ Mathematics
Add y to both sides:-
- 2x + 9 = y
y = 9 - 2x
ANSWER D
2007-07-27 07:46:26 · answer #1 · answered by Como 7 · 0⤊ 0⤋
You can perform any function to the equation just so long as you do it to both sides of the equals sign.
For example you could multiply both sides by 2
- 2x - y + 9 = 0
2(- 2x - y + 9) = 2(0)
- 2(2x) - 2y + 2(9) = 0
- 4x - 2y + 18 = 0
However, for your case, you want to isolate y from everything else. That means, y must be alone on one side of the '='.
The simplest way to do this is to add y to both sides of the equation
- 2x - y + 9 = 0
- 2x - y + 9 + y = 0 + y
- 2x + 9 = y
2007-07-27 12:17:31 · answer #2 · answered by Steve S 4 · 0⤊ 0⤋
Move the y to the other side of the equation:
-2x + 9 = y
answer is D.
2007-07-27 12:01:02 · answer #3 · answered by Becky M 4 · 1⤊ 0⤋
isolate y on one side of the eqn. So add y to both sides:
-2x + 9 = y, or y = 9 - 2x, answer D.
2007-07-27 12:02:17 · answer #4 · answered by John V 6 · 0⤊ 0⤋
D.
Subtract 9 from the left side and add it to the right. Same for the 2x. Since y is negative we flip the signs.
2007-07-27 12:02:20 · answer #5 · answered by nate q 3 · 0⤊ 0⤋
d)y=9-2x
2007-07-27 12:07:14 · answer #6 · answered by brilliantwaz 2 · 0⤊ 0⤋
-2x - y +9 = 0
+y = +y
--------------------
-2x +9 = y --> y = 9 - 2x
2007-07-27 12:04:13 · answer #7 · answered by Michael L 2 · 0⤊ 0⤋
D
2007-07-27 12:15:52 · answer #8 · answered by vpi61 2 · 0⤊ 0⤋
D
2007-07-27 12:05:49 · answer #9 · answered by SteveA8 6 · 0⤊ 0⤋