The solution of the equation below falls between what two integers?
2x + 8 = 7x + 20
A. -4 and -3 , B. -3 and -2, C. -2 and -1, D. 1 and 2, E. 2 and 3
thx
2007-07-30 16:36:39 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Please Explain
2007-07-30 16:37:21 · update #1
Perform the same operation to each side of the equation to simply it:
First subtract 8 from each side:
2x = 7x + 12
Now subtract 7x from each side:
-5x = 12
Now divide each side by -5:
x = -12/5
x = -2.4
-2.4 is between -2 and -3, so the correct answer is (B).
2007-07-30 16:41:07 · answer #1 · answered by lithiumdeuteride 7 · 0⤊ 0⤋
Solve for x:
2x - 7x = 20 - 8
-5x = 12
x = -(12/5) = -2.4 which lies between the integers -3 and -2
2007-07-30 23:46:08 · answer #2 · answered by Optimizer 3 · 0⤊ 0⤋
The answer is B: -2 and -3
2x + 8 = 7x + 20
-2x-20 -2x -20
-12 = 5x
-12/5 = -2.4
2007-07-30 23:45:50 · answer #3 · answered by laangel464 3 · 0⤊ 0⤋
2x + 8 = 7x + 20
-2x
8 = 5x + 20
-20
-12 = 5x
divide by 5
-12/5 = x
x = -12/5
x = -2 2/5
B
2007-07-31 00:19:29 · answer #4 · answered by Anonymous · 0⤊ 0⤋
2x + 8 = 7x + 20
5x = 8 - 20 = -12
x = -2.4
so the solution is between -2 & -3, hence (C) is the answer
2007-07-30 23:40:24 · answer #5 · answered by vlee1225 6 · 0⤊ 1⤋
2x + 8 = 7x + 20
-5x = 12
x = -12/5
x = -2 2/5
so, the answer would be B.
2007-07-30 23:43:10 · answer #6 · answered by peachi517 2 · 0⤊ 0⤋
2x+8=7x+20
2x=7x+12
-5x=12
x=12/-5
x=-2.4
ANSWER = B
2007-07-30 23:40:50 · answer #7 · answered by Ali 1 · 0⤊ 0⤋
2x + 8 = 7x +20
2x - 7x = 20 - 8
-5x = 12
x = -12/5
The answer is (B)
2007-07-30 23:47:39 · answer #8 · answered by Alexander Vincentius Yunus 3 · 0⤊ 0⤋
5x = -12
x = -2.4
Answer is 'B' as x lies between -3 and -2
2007-07-30 23:39:45 · answer #9 · answered by Anonymous · 1⤊ 0⤋