Is -9.3 a solution of the equation 12.8 – q = 3.5? Explain
the result is POSITIVE 9.3 bc when we add two numbers with the same sign the answer is positive..
RIGHT?
2006-11-21 15:23:26 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Plug in -9.3 to see if it works out:
12.8 - (-9.3) = 12.8 + 9.3 = 22.1 ≠ 3.5
So q = -9.3 is NOT a solution.
2006-11-21 15:27:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
alright, the whole point of this equation is to solve for q...here goes:
12.8 - q = 3.5
(move 12.8 over to the other side so we can get q by itself, remember, when you move numbers over the equal sign, you have to switch the sign, ex: 12.8 will become -12.8 when it moves over because it was originally positive)
- q = 3.5 -12.8
(now solve the right side)
- q = - 9.3
(now, you cannot keep that negative sign in front of the q because you want to get q all by itself. so pretend that there is a 1 between the negative sign and the q. so it would be -1q. -1q is the same thing as -q. to get q by itself, you now have to divide both sides of the equation by -1.)
-1q/-1 = -9.3/-1
q = 9.3 (when you divded both sides of the equation by -1, q and 9.3 both became positive because a negative divided by a negative equals a positive.
i hope that helped a bit :)
2006-11-21 23:31:35 · answer #2 · answered by susie q 2 · 0⤊ 0⤋
you're right. the answer should be +9.3. but the reason is not because they have the same sign that made 9.3 (+)
12.8-q=3.5
12.8-q-12.8=3.5-12.8 (subtract 12.8 to both sides of the equation)
-q=-9.3
q=9.3 (we multiply both sides of the equation by -1)
2006-11-21 23:30:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋
No, because you would then get the equation 12.8 + 9.3 = 3.5, which isn't true. The answer is simply 9.3
2006-11-21 23:27:38 · answer #4 · answered by marklemoore 6 · 0⤊ 2⤋
For the given equation
12.8-q=3.5
Add q to both sides of the equation, you'll get
12.8=3.5+q
Subtract 3.5 from each side
12.8-3.5=3.5-3.5+q
9.3=q
Therefore q is equal to +9.3
2006-11-21 23:34:19 · answer #5 · answered by mathpath 2 · 0⤊ 0⤋
-9.3 is NOT the correct answer. According to my calculations, you are correct. The answer I got is +(POSITIVE) 9.3.
2006-11-21 23:30:42 · answer #6 · answered by Anonymous · 0⤊ 0⤋
It's positive, but not for the reason you gave. When you MULTIPLY numbers with the same sign, the answer is positive.
2006-11-21 23:26:58 · answer #7 · answered by banjuja58 4 · 0⤊ 0⤋
Positive came to mind, so it must be negative.
2006-11-21 23:31:07 · answer #8 · answered by Answerer 7 · 0⤊ 0⤋
no, it is also negative. It becomes positive when you multiply them.
2006-11-21 23:26:12 · answer #9 · answered by 7 · 0⤊ 0⤋
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2006-11-21 23:25:53 · answer #10 · answered by k 2 · 0⤊ 0⤋