Easy

Algebra Level 1

If : X= 7×(a+b) , a= 3b , b-a = -6 , X= ?

-56 -35 84 31

William Cipto by William Cipto , 31, South Korea

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3 solutions

Noel Lo
Aug 1, 2015

x = 7(a+b) = 7(3b+b) = 7(4b) = 28b

b-a = b-3b = -2b

-2b = -6

b=3

x = 28(3) = 84

3 Helpful 1 Interesting 0 Brilliant 0 Confused
William Cipto
Jul 30, 2015

X= 7(a+b) = 7a+7b , a = 3b , b-a = b-3b = -2b , -2b = -6 , b=-6/-2 = 3 , a = 3b = 3×3 = 9 ,

7a+7b = (7×9)+(7×3)= 63+21 = 84 ...

Tell me if i'm wrong ... (sry for bad english )

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Azadali Jivani
Aug 2, 2015

As per given, a=3b & a=b+6
so 3b=b+6
there fore b=3
and b=a/3 & b=a+6
so a/3 = a+6
there fore a=9
X=7(9+3) =84 (Ans.)



0 Helpful 0 Interesting 0 Brilliant 0 Confused

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