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2015-04-26T15:58:09+08:00

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Lets represent:
Roy=x
Rose=y

x-7=6(y-7)
x+1=2(y+1)

x=6y-35

Substitute the value to the second equation:
6y-35=2(y+1)
6y-35=2y+2
Subtract both sides by 2y
4y-35-=2
Add both sides by 35
4y=37
Divide both sides by 4
y=37/4 or 9 and 3 months old

x=6y-35
Substitute the value of Rose's age
x=6(37/4)-35
x=111/2-35
x=41/2 or 20 and 5 months old,

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