ACT Preparation / Unit 9 ACT 0831 short lesson, about 20 seconds
Systems of Inequalities
Captions available
The idea
A system of inequalities is graphed by drawing each boundary line, solid if equality is included and dashed if not, shading each solution side, and keeping the overlap.
In practice
y ≥ x and y < 4 overlap above the line y = x and below a dashed y = 4.
Where people slip
Choose each side by testing a point off the boundary.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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