L1 – Grade 9 REVIEW – Equations of Lines
⚫ 3 Types of Lines
1. Diagonal Lines: Equations are written in either…
Slope-Intercept Form:
or
Standard Form:
2. Horizontal Lines:
y=b
3. Vertical Lines: x = a
y = mx + b
Ax + By + C = 0
Review - Examples
EXAMPLE 1: Find the slope and y-intercept for each
of the following
a)
5
y = x−2
3
b)
2x + 3y − 9 = 0
Review - Examples
EXAMPLE 2: Find the equation of the line with…
a)
1
a slope of and passing through the point (3, 2)
2
Review - Examples
EXAMPLE 2: Find the equation of the line with…
b)
a slope of − 2 and passing through the point (-1, -7)
Review - Examples
EXAMPLE 3: Find the equation of the line passing
through the following points…
a)
(-2, 5) and (4, 17)
Review - Examples
EXAMPLE 3: Find the equation of the line passing
through the following points…
b)
(6, -3) and (-9, 7)
Review - Examples
EXAMPLE 4: Write an equation for the horizontal line
and the vertical line through each point.
a) (-2, 5)
Review - Examples
EXAMPLE 4: Write an equation for the horizontal line
and the vertical line through each point.
b)
( ½ , -2)