SOLUTION: 21 = 3
a+2 a-1
Algebra.Com
Question 214005: 21 = 3
a+2 a-1
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
If you meant:
21/(a+2)=3/(a-1)
Then:
21(a-1)=3(a+2)
21a-21=3a+6
21a-3a=6+21
18a=27
a=27/18
a=3/2 ans.
Proof:
21/(3/2+2)=3/(3/2-1)
21/(7/2)=3/(1/2)
21*2/7=3*2/1
42/7=6
6=6
RELATED QUESTIONS
3/a-4+2/a+3-21/aČ-a-12 (answered by ikleyn)
a^2 + 10a =... (answered by Tatiana_Stebko)
what is equal to (6^-7)^3?
A. (1/6)^21
B. (-1/6)^-21
C. (1/6)^-21
D.... (answered by lynnlo)
From a tank 1/3 full of water, 21 liters loss due to leaking, 1/2 water remained.... (answered by josgarithmetic,MathTherapy)
I need to factor and I do not understand this equation, please help... (answered by stanbon)
{{{(2/3)/(5/4)of(20/21)}}}=?
(A)7/8 (B)1/3 (C)32/63 (D)... (answered by ewatrrr)
Find the general form of the equation of the plane passing through the points
A (3, 2,... (answered by ikleyn)
Write a quadratic equation having the given numbers as solutions.... (answered by ankor@dixie-net.com)
Find the general equation of the line: y = (2)/(3) x - 7
a)2x-3y=21
b)2x+3y=21... (answered by rwm)