Respuesta :
Lets say phil is 4 right now, that means tim is 12. 2 years ago tim was 5 times phils age. That means when phil is 2 and tim is 10, 10÷2=5. In 4 years phil will be half tims age. so when tim is 16, phil must be 8. According to my math, that ahould be correct
Let
x----------> Phil's age now
y--------> Tims's age now
we know that
[tex] x+4=\frac{y+4}{2} \\ \\ 2x+8=y+4 [/tex]
[tex] y=2x+4 [/tex] equation [tex] 1 [/tex]
[tex] y-2=5(x-2)\\ y-2=5x-10 [/tex]
[tex] y=5x-8 [/tex] equation [tex] 2 [/tex]
equate equation [tex] 1 [/tex] and equation [tex] 2 [/tex]
[tex] 2x+4=5x-8\\ 5x-2x=4+8\\ 3x=12\\ x=4 [/tex]
find the value of y
[tex] y=2x+4\\ y=2*4+4\\ y=12 [/tex]
therefore
the answer is
Phil's age now is [tex] 4 [/tex] year old