maths equation
2006-10-09 05:49:15 · 26 answers · asked by kylepato 1 in Education & Reference ➔ Homework Help
7a+4=3a+18
7a-3a+4=3a-3a+18
4a+4=18
4a+4-4=18-4
4a=14
1/4*4a=1/4*14
sooo
a=14/4
or 7/2 or 3 1/2
2006-10-09 05:53:54 · answer #1 · answered by ezgoin92 5 · 0⤊ 0⤋
You need to phrase your question properly. You've asked what is 7a + 4 = 3a + 18? The answer: That is AN EQUATION, which you've also answered. Was that the answer you wanted? If you wanted a value for "a" then you should have asked to SOLVE the equation. Next time you know.
2006-10-09 13:01:59 · answer #2 · answered by Einmann 4 · 0⤊ 0⤋
First combine like terms:
7a-3a=18-4
4a=14
Divide both sides by 4
a=14/4 or 7/2
2006-10-09 12:54:32 · answer #3 · answered by scootgus69 1 · 0⤊ 0⤋
It's a simple question, just take it step-by-step.
7a + 4 = 3a + 18
Subtract 3a from both sides:
7a + 4 = 3a + 18
4a + 4 = 18
Subtract 4 from both sides:
4a = 14
Solve for a:
a = 14/4
a = 7/2 or 3.5
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*Always* check your answer:
7(7/2) + 4 = 3(7/2) + 18 ?
49/2 + 4 = 21/2 + 18 ?
49/2 + 8/2 = 21/2 + 36/2 ?
57/2 = 57/2 <== Checks!
2006-10-09 12:54:10 · answer #4 · answered by Mitch 7 · 1⤊ 0⤋
7a + 4 = 3a + 18
7a - 3a = 18 - 4
4a = 14
a = 3-1/2
2006-10-09 12:57:21 · answer #5 · answered by Anonymous · 0⤊ 0⤋
a = 3.5
to do this, you can subtract 3a from 7a, and you get 4a. That puts the variables together. What you do to one side, you must do to the other, too.
Now, subtract 4 from 18, and you get 14.
4a = 14
divide both numbers by 4 to get 'a' alone.
a = 3.5
Now to check, simply insert 3.5 on both sides, and it will check out.
7a + 4 = 3a + 18
7(3.5) + 4 = 28.5
3(3.5) + 18 = 28.5
2006-10-09 13:14:25 · answer #6 · answered by angel 2 · 0⤊ 0⤋
7a+4=3a+18
or
7a - 3a = 18 - 4
4a= 14
or a=14\4=3.5
2006-10-09 13:06:35 · answer #7 · answered by latif_1950 3 · 0⤊ 0⤋
7a-3a= 18-4; 4a=14; a=7/2
2006-10-09 12:52:34 · answer #8 · answered by Anonymous · 0⤊ 0⤋
7a + 4 = 3a + 18
7a - 3a = 18 - 4
4a = 14
a =14 / 4
a = 3.5
2006-10-09 13:03:40 · answer #9 · answered by Anonymous · 0⤊ 0⤋
7a-3a=18-4
4a=14
a= 3 1/2
2006-10-11 19:24:48 · answer #10 · answered by flansis 2 · 0⤊ 0⤋