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Lisa is seven times as old as her brother. She will be four times as old as her brother in three years. Represent the above situation in mathematical form.

Respuesta :

Answer:

Let B = the brothers age now

Let L = Lisa's age now

 

Then today:

 

L = 7B

 

And three years from now, Lisa's current age plus 3 equals 4 times the brothers age plus 3 represented by the following formula

 

L+3 = 4(B+3)

 

Now we can substitute the value of L in the first formula for L in the second formula

 

7B + 3 = 4(B+3)

 

So the answer is C

Step-by-step explanation:

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