What is the formula for calculating the slope of a line?

• Slope = (y2 – y1) / (x2 – x1)

• Slope = (x2 – x1) / (y2 – y1)

• Slope = (y2 + y1) / (x2 + x1)

• Slope = (x2 + x1) / (y2 + y1)

What does a positive slope indicate about a line's direction?

• The line rises as it moves from left to right

• The line falls as it moves from left to right

• The line is horizontal

• The line is vertical

What is the slope of a horizontal line?

• Zero

• Undefined

• Positive

• Negative

What is the relationship between the slopes of two perpendicular lines?

• They are negative reciprocals of each other

• They are equal

• They are both zero

• They are both undefined

In which real-world scenario can slope be used to predict trends?

• Economics to determine the rate of change in cost or revenue

• Cooking to measure ingredients

• Art to choose colors

• Music to compose melodies