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2-3 Proportional Relationships and Graphs

2-3 Proportional Relationships and Graphs

Author: Hector Soto
Description:
  • Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.
  • Identify the constant of proportionality (unit rate) in tables, graphs, equations, diagrams, and verbal descriptions of proportional relationships.
  • Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.
  • Explain what a point (x, y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0, 0) and (1, r) where r is the unit rate.
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Tutorial

Proportional Relationships and Graphs Pt.2

Source: YouTube: Sara Sholes

Proportional Relationships and Graphs Pt.1

Source: YouTube: Sara Scholes