# Chapter 5 (p. 256)

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Sections: 5-1,5-2,5-3,5-4,5-5,5-6,(skip 5-7)

### constant of variation

(p.264) the variable "k", in the equation: y=kx, is the constant of variation

### direct variation

(p. 264) the formula: y=kx is the direct variation equation

### negative correlation

(p. 298) as the variable "x" increases the variable "y" decreases

### parallel lines

(p. 292) lines that have the same slope

### perpendicular lines

(p. 293) lines that intersect at right angles

### point-slope form

(p. 286) y-y1=m(x-x1)

### positive correlation

(p. 298) as the variable "x" increases, the variable "y" increases

### rate of change

(p. 258 tells on average how a quantity is changing over time

### rate of change

(p. 258) tells on average how a quantity is changing over time

### slope

(p. 256) a number determinded by two points on the line

(p. 272) y=mx+b

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