Home/Algebra/Functions/Parallelism and perpendicularity10. FunctionsParallelism and perpendicularityLevel: fundamentalIn 10. FunctionsFormulaCopy LaTeXm1=m2;m1m2=−1m_1=m_2;\quad m_1m_2=-1m1=m2;m1m2=−1Tagsalgebraalgebra formulaFunctionsDetailSlope criteria for nonvertical lines.Explore the ideaFound an error? Contact us.Related formulasRelatedLiney=mx+b;m=y2−y1x2−x1y=mx+b;\quad m=\frac{y_2-y_1}{x_2-x_1}y=mx+b;m=x2−x1y2−y1Open formulaOpen in sectionRelatedAngle between vectorscosθ=u⋅v∥u∥∥v∥\cos\theta=\frac{u\cdot v}{\|u\|\|v\|}cosθ=∥u∥∥v∥u⋅vOpen formulaOpen in section