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Create a system of equations to solve Roberto is twice as old as katie. In 4 years,Roberto will be eight years older than katie. How old is Roberto? Roberto is ______years old. …
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Create a system of equations to solve Roberto is twice as old as katie. In 4 years,Roberto will be eight years older than katie. How old is Roberto? Roberto is ______years old. …
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Mar 14, 2020
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Create a system of equations to solve
Roberto is twice as old as katie.
In 4 years,Roberto will be eight years older than katie.
How old is Roberto? Roberto is ______years old.
How old is Katie? Katie is ______years old.
Mathematics
middle-school
Esteban Gatjens
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Esteban Gatjens
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R=2K which equals 2R=4K
4(R=K+8) or 4R=4K+32
Subtract first equation from second equation.
2R=32 so R=16
Plug into first equation
16=2K so K=8
Now plug both into second equation to check
4R-4K=4(R-K)=4(8)=32 it works
So Roberto is 16 and Katie is 8
(In 4 years R would be 20 and K would be 12 which has a difference of 8)
Isa Souza
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Mar 20, 2020
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Isa Souza
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