1. 3.4 (Day 1) Linear Equations
Today’s Date:
11/6/17

2. Forms of Linear Equations
Standard Form:
- No Fractions & A is positive
Slope-Intercept Form:
m is slope b is y-intercept: (0, b)
Point-Slope Form:
m is slope is point on line
Need to calculate slope

3. Ex 1) Find an equation of the line with slope -2 & passes through (-1, 4) & Draw Graphy x
(-1, 4)
Graph point (-1, 4)
Move slope
(Down 2, Right 1
OR Up 2, Left 1)

4. Ex 2) Find an equation of the line with
slope 3 & y-intercept -2 & Draw Graph y x
Graph y-intercept (0, -2)
Move slope
(Up 3, Right 1
OR Down 3, Left 1)
(0, -2)
If want Standard Form:

5. 3.4 (Day 2) Linear Functions
Today’s Date:
11/6/17

6. Use slope = 4/3 and point (0, 4) and plug into slope formula
Ex 3) Find an equation, in Standard Form, of the line with x-int –3 & y-int 4
x-int: (–3, 0) y-int: (0, 4)
Use slope = 4/3 and point (0, 4) and plug into slope formula

7. Parallel & Perpendicular Lines
║ Parallel lines have SAME slope
┴ Perp lines have Opposite Reciprocal slopes

8. Ex 4) Find an eqtn in Point-Slope Form of the line through (–7, 2) and
perpendicular to –2x + 3y = 7
Find slope of –2x + 3y = 7:
┴ slope:

9. Find slope of 9x – 7 = 3y: m = 3 ║ slope = 3 & y-int 5 = b y = mx + b
Ex 5) Find eqtn in Slope-Intercept form of the line with y-int 5 and parallel to 9x – 7 = 3y
Find slope of 9x – 7 = 3y:
m = 3
║ slope = 3 & y-int 5 = b
y = mx + b
y = 3x + 5

10. Ex 6) Piecewise Function (broken line)
Draw the graph of:
It’s a function, it passes the vertical line test y x
then erase right of 2
then erase left of 2

11. It’s only going thru the x-axis
Ex 7) T.O.O.
Find an equation in Standard Form of the line
through (5, 7) & slope is undefined OR
(5, 7)
Undefined
It’s only going thru the x-axis
x = 5

12. Homework Due 11/8 Wednesday #306 Pg. 186 46 – 64 even
Pg – 7 odd
#307 Pg – 39 odd
Due 11/8 Wednesday
Homework
HW 306 & 307