Vivian L. answered • 10/21/13

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Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACH

Hi Again Roseland;

Kaleigh is three times as old as Juan. Seven years ago she was four times his age. how old are they both now?

K=3J

(k-7)=4(J-7)

Let's substitute...

(3J-7)=4(J-7)

3J-7=4J-28

Let's proceed to isolate J...

Let's add 28 to both sides...

28+3J-7=4J-28+28

3J+21=4J

Let's subtract 3J from both sides...

-3J+3J+21=4J-3J

21=J

J=21

K=3(J)=3(21)=63

Seven years ago...

J=21-7=14

K=63-7=56

Does (14)x(4)=56

Yes!