The graph of a linear equation contains the points (3,11) and (-2,11). which point also lies on the graph? (you must show work)

Y= ax+b

when x=3, y=11   and when x= -2, y=11
          3a+b=11
          -2a+b=11    | * -1
3a+b=11
2a-b=-11

  5a=0, a=0:5, a=0
⇒ b=11
y=11 for every x
So ( 1,11)  or (2,11) are also points on the graph

The answer is 10. and if you go by pemdas you would 1. multiplication 2. division 3. addition 4. subtraction