If the constraints in a linear programming problem are changed

Which of the following statements is correct?

By graphical method, the solution of linear programming problem

Maximize $\mathrm{Z}=3x_1+5x_2$

Subject to $3x_1+2x_2\le 18$

$x_1\le 4$

$x_1\ge 0,x_2\ge 0,\text{ is }$

• unbounded in first quadrant
• unbounded in first and second quadrants
• bounded in first quadrant
• 
  none of these

• (30, 25)
• (20, 35)
• (35, 20)
• 
  (40, 15)

The corner points of the feasible region determined by the following system of linear inequalities: $2x+y\le 10,x+3y\le 15,x,y\ge 0\text{ are }(0,0),(5,0),(3,4)$and $(0,5).$ Let $Z=px+q{y}_{\text{'}}$ where $p, q>0.$ Condition on $p$ and $q$ so that the maximum of $Z$ occurs at both $(3, 4)$ and $(0,5)$