Let
x--------> the number of weeks
y--------> Jon weighs in lb
z--------> Matt weighs in lb
we know that
\(y = 148+2x\) ----> equation \(1\)
\(z = 198-x\) ----> equation \(2\)
equate equation \(1\) and equation \(2\)
\(148+2x=198-x\)
\(2x+x=198-148\)
\(3x=50\)
\(x=\frac{50}{3} =16.7\ weeks\)
using a graph tool
see the attached figure
therefore
the answer is
On the \(17\)th week
