Question:
10 (-9x – 9y) = 90
Divide both sides with 10
-9x – 9y = 9
Divide again by 1
-1x -1y = 1
And I have the answer is:
Y = -1x -1
My question is how to make it like that…
Totally confuse!!!
Pls help…
2007-02-27 18:29:47 · 3 answers · asked by You think you know me? 6 in Science & Mathematics ➔ Mathematics
10 (-9x – 9y) = 90
Divide both sides with 10
-9x – 9y = 9
Divide again by 1 ----> Divide by 9 and not 1
-1x -1y = 1
Add 1x to both sides--> -1y = 1 +1x
Divide by -1 on both sides and you get
Y = -1x -1
2007-02-27 18:41:32 · answer #1 · answered by harsh_bkk 3 · 0⤊ 0⤋
What you did is correct. If I understand you correctly, your difficulty is in getting from:
-1x -1y = 1
to
y = -1x -1
Here's how you do it.
-1x -1y = 1
Add 1y to both sides:
-1x -1y +1y = 1 + 1y
Combine the y's on the left side to get:
-1x = 1 + 1y
Subtract 1 from both sides:
-1x - 1 = 1 + 1y -1
Combine the 1's on the right side:
-1x -1 = 1y
If the left side equals the right side, then the right side equals the left side.
1y = -1x -1
Or simply,
y = -x -1
Hopefully that helps!
2007-02-28 02:43:50 · answer #2 · answered by Bramblyspam 7 · 0⤊ 0⤋
all right but second step divide by 9 not by 1
2007-02-28 02:50:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋