solve the equations the show how you soved them . having trouble .
2006-08-14 08:50:05 · 14 answers · asked by pennygj4u 1 in Science & Mathematics ➔ Mathematics
2+8 = 10 so 9 +1 = 10
12-5 = 7 so 11-4=7
2006-08-14 08:55:32 · answer #1 · answered by Duds331 5 · 0⤊ 0⤋
2+8=9+?
subtract 9 both sides
2+8 - 9=9+?-9
(2+8) - 9=(9-9)+?
10 - 9 = ?
1 =?
11-?=12-5
Take out 11 both sides
11-11-? = 12 - 5 -11
(11-11)-? = 12 - (5 +11)
-? = 12 - 16
-? = - 4
Remove negative sign both sides
? = 4
2006-08-14 16:03:27 · answer #2 · answered by Amar Soni 7 · 0⤊ 0⤋
is it more complicated than - 2+8=9+1, 11-4=12-5?
2006-08-14 15:57:35 · answer #3 · answered by wonderblu 1 · 0⤊ 0⤋
Let "x" be the number that you don't know
2 + 8 = 9 + x
10 = 9 + x
10 - 9 = x --> (move 9 to the left side and dont forget to change the sign from positive to negative)
1 = x
The answer :
2 + 8 = 9 + 1
To prove:
2 + 8 = 9 + 1
10 = 10
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Let "x" be the number that you don't know
11 - x = 12 - 5
11 - x = 7
-x = 7 - 11 -->(move 11 to the right side and dont forget to change the sign from positive to negative)
-x = -4 -->(divide both side by -1) and you'll get :
x = 4
The answer:
11 - 4 = 12 - 5
To prove:
11 - 4 = 12 - 5
7 = 7
2006-08-15 10:47:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
2+8 = 9 + x anything you do to 1 side you must do to the other
2 + 8 - 9 = 9 + x - 0
1= x
11 - x = 12-5
11-x-11 = 12-5-11
-x = -4
divide both by -1
x=4
2006-08-14 15:58:26 · answer #5 · answered by walks_on_water2004 1 · 0⤊ 0⤋
8+2 = 10
10=9+? => ? = 10-9 = 1
12-5= 7
11-?=7 => 11-7 = 4 =?
as simple as that!
2006-08-14 15:57:01 · answer #6 · answered by Know it all 2 · 0⤊ 0⤋
2+8=9+?
subtact 9 from both sides
2+8-9=9-9+?
1?
11-?= 12-5?
-?= 12 - 5 - 11 = -4
?=4
2006-08-14 15:59:34 · answer #7 · answered by TC 3 · 0⤊ 0⤋
treat the ? as an unknown number and do youir things :
1) 2+8=9+?
subtract 9 from both sides
( i just learned that this is a property of the equality sign..... )
this will give you
2+8 - 9 = 9+? - 9
or 2+8 - 9 = ?
and Voila ther is your answer 2+8-9 = ? or 1 = ?
the other one goes the same ..
2006-08-14 15:57:43 · answer #8 · answered by gjmb1960 7 · 0⤊ 0⤋
problem: 2+8=9+x
solution: put the unknown variable on one side and the rest on the other side. note that when you move a variable from one side to the other, the sign changes (from + to - and vice versa) so,
x=2+8-9
do the math,
x=1
thats the answer.
problem: 11-x=12-5
solution: x=11-12+5
answer: x=4
2006-08-14 16:02:41 · answer #9 · answered by r_y_s_s_a 3 · 0⤊ 0⤋
2+8-9=?
10-9=?=1
11-(12-5)=?
11-7=?=4
2006-08-14 15:59:15 · answer #10 · answered by Yara 2 · 0⤊ 0⤋