2006-07-06 15:16:33 · 12 answers · asked by tsalieuten 1 in Science & Mathematics ➔ Mathematics
Solve 2x + 3 = 9
Substract both sides by 3,
2x + 3 - 3 = 9 - 3
2x + 0 = 6
2x = 6
Divide both sides by 2,
2x/2 = 6/2
x = 3 (answer)
2006-07-06 16:36:12 · answer #1 · answered by ideaquest 7 · 0⤊ 0⤋
x=3
2006-07-07 00:11:01 · answer #2 · answered by Anonymous · 0⤊ 0⤋
9-3=6 6\2=3 2*3+3=9
2006-07-06 22:22:38 · answer #3 · answered by trogdoer 2 · 0⤊ 0⤋
this is hard to describe because this is the very simplest of algebra
it is very important to understand how this works because all the rest of math relies on it
you can start by just looking at it and realizing that something is added to 3 to get 9. that something has to be 6, right?
then you see that something is multiplied by 2 to get the 6, that something, x, has to be 3
okay, in algebra, we have a systematic way of getting the answer that still works when they get too hard to just look at and figure out
2x + 3 = 9 that means that the 2x + 3 equals, or is the same as 9
if you do anything to the 2x + 3, and do the same thing to the 9, they should still be equal
with that in mind we will manipulate the equation until x is by itself and equalling something. this is called solving for x
2x + 3 =9 we will subtract 3 from each side of the equation
2x + 3 -3 = 9 - 3
2x = 6 now we will divide both sides by 2
2x/2 = 6/2
2/2=1 so we get 1x or a single x or x=6/2=3
x=3, same as we got before
now check it, put the 3 back in for x and see if you got a solution that works
2*(3)+3=9
6+3=9
9=9
hooray
keep at it
math rules, literally
2006-07-06 22:25:26 · answer #4 · answered by enginerd 6 · 0⤊ 0⤋
2(x)+3=9. x=3
2006-07-06 22:21:20 · answer #5 · answered by Anonymous · 0⤊ 0⤋
The expression is algebraic the idea is to get "x" by itself. dividing both sides by 2 won't work as 2 will not divied evenly into 9, so subrtact the 3 from both sides that leaves 2x=6 now divided both sides by 2 2x+3=9
2x +3 -3 =9-3
___________
2x=6
2x/2 =6/2
x = 3 so 2(3)+3=9
2006-07-06 22:44:31 · answer #6 · answered by pep 1 · 0⤊ 0⤋
You subtract three from both sides. Then 2x=6. Then you divide both sides by two. Then x=3. so it is 2(3)+3=9; 6+3=9; 9=9
2006-07-06 22:34:03 · answer #7 · answered by jarnvila88 2 · 0⤊ 0⤋
subtrract 3 from both sides (2x+3)-3=9-3
divide both sides by two 2x/2=6/2
simplify x=3
2006-07-06 22:22:23 · answer #8 · answered by I love to ball 3 · 0⤊ 0⤋
first subtract 9 minus 3 then the answer divide it by 2 if you get 3 you are wright
2006-07-06 22:22:39 · answer #9 · answered by A G 1 · 0⤊ 0⤋
2x=9-3
2x=6
x=3
2006-07-06 22:20:10 · answer #10 · answered by C-Mick 3 · 0⤊ 0⤋