please help me with my math homework. these are the questions.
use mental math to solve the equation.
1) 3x= -21 2) -12x= -36
2007-10-26 09:22:09 · 15 answers · asked by JP 1 in Education & Reference ➔ Homework Help
1) -7
2) 3
erano semplicissime...mettine ancora :)
2007-10-26 09:26:38 · answer #1 · answered by superlara0 3 · 1⤊ 2⤋
1. x=-7
2. x=3
2007-10-26 16:25:45 · answer #2 · answered by Anonymous · 1⤊ 3⤋
1) x=-7 2)x=3
2007-10-26 16:25:41 · answer #3 · answered by Mark C 1 · 1⤊ 3⤋
1) x=-7 2)x=3
2007-10-26 16:25:10 · answer #4 · answered by Anonymous · 1⤊ 3⤋
The key phrase is MENTAL math -- meaning they should be easy enough to figure out IN YOUR HEAD...
You need to think -- what times 3 equals negative 21? (What number when multiplied by 3 is -21...or what do you get when you divide 3 into negative 21?)
What times negative 12 equals negative 36? (or -- what do you get when you divide -12 into -36?)
Remembering that...
negative times negative equals positive
negative times positive equals negative
2007-10-26 16:27:24 · answer #5 · answered by Anonymous · 1⤊ 1⤋
1) x = -7
2) x = 3
2007-10-26 16:24:46 · answer #6 · answered by Airbo15 2 · 1⤊ 2⤋
If 3x is -21, x is -7.
If -12 x = -36, 12x is 36, and x is 3.
If this or any other answer to your question helps you resolve this issue, please select a "best answer." This motivates people to help you and rewards their research in your behalf.
Cheers,
Bruce
2007-10-26 16:25:27 · answer #7 · answered by Bruce 7 · 1⤊ 4⤋
1. x= -7
2. x= 3
to solve these all you have to do is divide both sides by the coefficient of x.
2007-10-26 16:26:37 · answer #8 · answered by cee 3 · 1⤊ 2⤋
1) -7
2) 3
2007-10-26 16:26:58 · answer #9 · answered by NINJA 2 · 1⤊ 2⤋
Why can't you just use a caculator and what grade is this? Sorry but can't help you. Guess that is what I do it is just homework right. Unless it is a grade of course then you are screwed. Just kidding!
2007-10-26 16:25:38 · answer #10 · answered by pretty and smart 25 2 · 1⤊ 2⤋