2007-01-11 10:24:51 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
"Solve for" means get the variable (the letter) on one side of the equal sign by itself. So you'll have x = something. Your equation is 4x - 8 = 4. So x is being multiplied by 4 and having 8 taken away from it.
We know that in order to undo subtraction (take away) you must add and in order to undo multiplying you must divide. The trick is to remember whatever you do to one side of the equal sign you also have to do to the other side.
So 4x - 8 = 4. Let's add 8 to both sides. We get:
4x - 8 (+8) = 4 (+8)
When we simplify we get
4x = 12
Got that? Now we have x still being multiplied by 4. So to undo this we'll divide BOTH sides by 4. Now we get:
4x (/4) = 12 (/4)
When we simplify we get
x = 3
That's it. That's your answer. Hope this helps.
Good luck in your math.
2007-01-11 10:48:10 · answer #1 · answered by Chaney34 5 · 0⤊ 0⤋
4x-8=4
+8 +8
_4x=_12__
4 = 4
x=3
2007-01-11 18:46:14 · answer #2 · answered by Anonymous · 0⤊ 0⤋
ok
4x-8 = 4
add 8 to both sides
4x = 12
so
x = 12/4 = 3
2007-01-11 18:29:49 · answer #3 · answered by bad_sector 3 · 0⤊ 0⤋
x: 4x-8=4
add 8 to both sides.
x:4x=12
divide by 4.
x=3
2007-01-11 18:29:56 · answer #4 · answered by angelsoldier 1 · 0⤊ 0⤋
4x=4+8
4x=12
x=3
2007-01-11 18:34:52 · answer #5 · answered by Ms. BLONDE 2 · 0⤊ 0⤋
4x=4+8
4x=12
x=3
2007-01-11 18:29:48 · answer #6 · answered by Jack 2 · 0⤊ 0⤋
4X-8=4
add 8 to each side
4X=12
divide each side by 4
X=3
2007-01-11 18:30:04 · answer #7 · answered by afling78 2 · 0⤊ 0⤋