I got Y = 2x-7....
my book says it is wrong, please tell me why
2007-08-20 06:33:03 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
the book says y=2x +7....
2007-08-20 06:38:54 · update #1
ok, let's see. You see, you have to subtract 2 from both sides of the equation:
2x-y=7
-2x -2x
-y=7-2x or -y=-2x+7
as you can see, the y is negative, so since they're asking for the value of positive y, you have to divide all sides of the equation by (-1) where your final result is y=-7+2x or y=2x-7. As far as i'm concerned it is the book that is wrong. Regardless of what the book says, that is the correct answer.
2007-08-20 06:51:15 · answer #1 · answered by kenny r 2 · 1⤊ 0⤋
Your book is wrong and you are correct.
y = 2x - 7
2007-08-20 06:40:27 · answer #2 · answered by skipper 7 · 0⤊ 0⤋
2x - y = 7
-y = 7-2x
y = 2x-7 ... correct
what answer does your book give?
2007-08-20 06:39:19 · answer #3 · answered by Kathleen 1 · 0⤊ 0⤋
2x = 7 + y
y = 2x - 7 is the correct answer.
2007-08-20 06:59:43 · answer #4 · answered by Como 7 · 0⤊ 0⤋
Isolate y.
2x - y = 7
2x - y + y = 7 + y
2x - 7 = 7 + y - 7
y = 2x - 7
2007-08-20 06:41:03 · answer #5 · answered by Anonymous · 0⤊ 0⤋
2x-y=7
add Y to both sides
2x=7+y
subtract 7 from both sides
2x-7=y
so your answer is
Y=2x-7
What does your book say is the correct answer?
Because I think your book has a typo, you got the correct answer the first time you tried it.
2007-08-20 06:38:26 · answer #6 · answered by Wannabepilot 1 · 0⤊ 0⤋
WHS is right although there are always different ways to do math problems...if the book says its y= 2x + 7 then I'm sure they want you to do it how WHS did it.
2007-08-20 06:47:11 · answer #7 · answered by Anonymous · 0⤊ 0⤋
2x-y=7
-2x -2x
-y=7-2x
(-1)-y=7-2x(-1)
y=7+2x
y=2x+7
2007-08-20 06:41:57 · answer #8 · answered by WHS08 2 · 0⤊ 0⤋
sure the book isn't wrong?
2007-08-20 06:36:51 · answer #9 · answered by Anonymous · 0⤊ 0⤋