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12 questions from this quiz
How steep a line is
Vertical change over horizontal change
222
m1=m2m_1 = m_2m1=m2
Parallel
m1×m2=−1m_1 \times m_2 = -1m1×m2=−1
−14-\frac{1}{4}−41
Perpendicular
−32-\frac{3}{2}−23
So they look perpendicular visually
No, always check gradients
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