Answer:
B(4, 7)
Step-by-step explanation:
[tex]M(3,\,3)\,,\quad A(2,\,-1)\,,\quad B(x_B,\,y_B)\\\\\overline{AM}=\overline{MB}\ \implies\ x_M-x_A=x_B-x_M\ \ \wedge\ \ y_M-y_A=y_B-y_M\\[/tex]
[tex]3-2=x_B-3\qquad\wedge\qquad 3-(-1)=y_B-3\\\\ 1=x_B-3\qquad\qquad\wedge\qquad\ \ 3+1=y_B-3 \\\\ {}\quad x_B=4\qquad\qquad\wedge\qquad\qquad \ y_B=7[/tex]
