A fit the first one and B for the second one
(+3x+4y=2)
(+4x-4y=12)
-----------------
7x = 14
-----------------
7
X=2
3(2)+4y=2
6+4y=2
4y=-4
Y=-1.
Or you can plug x into the other equation.
4(2)-4y=12
8-4y=12
-4y=4
Y=-1.
It is a function and yeas
Do 200 / 10 which equals 20 pgs/hr.
Then do 320 / 20 which equals 16 hours to read a 320 page book
Conclusion: It would take Jerry 16 hours to read a 320 page book
128.72 should be the right answer