Respuesta :

legolasgreenleaf

Answer:

14 years old

Step-by-step explanation:

let x= Xavier’s age

let y= Madeline’s age

Use linear function:

x+y=28

x=1/2y + 4

x+y=28

x-1/2y=4

Multiply 2nd equation by 2

x+y=28

2x-y=8

Add

3x=36

x=12

12+2=14

y=16

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