Algebra 1 4.5

Slide 1: 

1. Rewrite 5x + y = 8 so y is a function of x. 2. Find the slope of the line that passes through (–5, 6) and (0, 8). ANSWER ANSWER y = –5x + 8 Bell Ringer WarmUps

Slide 4: 

EXAMPLE 1 Identify slope and y-intercept Identify the slope and y-intercept of the line with the given equation. y-intercept slope slope y-intercept slope

Slide 5: 

EXAMPLE 1 Identify slope and y-intercept Identify the slope and y-intercept of the line with the given equation. GUIDED PRACTICE for Example 1 slope y-intercept slope y-intercept slope y-intercept

Slide 6: 

EXAMPLE 2 Graph an equation using slope-intercept form Graph the equation 2x + y = 3.

Slide 7: 

Remember slope is rise/run so -2 is -2/1

Slide 8: 

EXAMPLE 2 Graph an equation using slope-intercept form 4. Graph the equation y = –2x + 5. GUIDED PRACTICE for Examples 2 and 3

Slide 9: 

Parallel Lines have the same slope (m) but different y-intercepts (b) y = -2x + 1 and y = -2x – 3 are parallel lines Perpendicular Lines have slopes that are negative reciprocals y = -2x + 1 and y = ½x – 3 are perpendicular lines y = -2x + 1 and y = 3x – 3 are neither parallel or perpendicular lines

Slide 10: 

Classify parallel and perpendicular lines EXAMPLE 4 Tell whether the lines are parallel, perpendicular, or neither. SOLUTION

: 

Classify parallel and perpendicular lines EXAMPLE 4

Slide 12: 

GUIDED PRACTICE for Example 4 GUIDED PRACTICE Tell whether the lines are parallel, perpendicular, or neither. ANSWER ANSWER perpendicular neither

Homework 4.5 : 

Homework 4.5 Pages: 247 – 250 Exs: 4 – 34 even, 46, 47