graphing_systems_of_inequalities_2: Remove getVAR

Test Plan:
Clicked the button.

Auditors: eater
graphing_systems_of_equations: Remove getVAR

Test Plan:
Clicked the buttons.

Auditors: eater
measuring_angles: Remove getVAR

Test Plan:
Clicked the buttons.

Auditors: eater
graphing_points{,_2}: Remove getVAR

Test Plan:
Clicked the buttons.

Auditors: eater