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My brother is 4 times as old as I am. Six years from now, he will be twice as old as I will be. How old is my brother now?

 Apr 2, 2020
 #1
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Your brother = \(b\)

You = \(y\)

 

\(b=4y\text{ right now}\)

\((b+6)=2(y+6)\text{ 6 years from now}\)

 

Now solve.

 Apr 2, 2020
 #2
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So i got b=2y+6 but how do I solve b?

 Apr 2, 2020
 #3
avatar+633 
+1

Hint: Use substitution


We have the equations:

(1) b = 4y

(2) (b + 6) = 2(y + 6)

 

Substitute (1) and (2) to get rid of the b variable.

So now we have:

(4y + 6) = (2y = 6)

 

Solve for y, then plug it back into the original equation to solve for b.


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