Question: If a graph represents a proportional relationship and passes through (4,10) , what is the constant of proportionality , and what is the equation?
A) 2.5;y=2.5x
B) 2.5;y=x+2.5
C) 2.5;y=10x
D) 4;y=2.5x
Correct answer: A
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.2d