Section 4.3 ­ Quick Graphs Using Intercepts
x­intercept
the x­coordinate of a point where a graph crosses the x­axis
y­intercept
the y­coordinate of a point where a graph crosses the y­axis
Finding intercepts:
x­intercept
substitute 0 for y
y­intercept
substitute 0 for x
Steps to Graph Using Intercepts
1. Find the x and y intercepts.
2. Plot the points and draw a line through them.
Graph each equation.
1. x ­ 2 = 4y
2. y = ­6 + 3x
3. 2x + 5y = ­10
4. 0.5y = ­2x + 8
5. You sold tickets to the school play. Advanced tickets were $4. Tickets bought at the door were $5.50. Total ticket sales were $440. Let x represent the number of advanced tickets sold and y represent the number of tickets sold at the door.
a. Write an equation to represent the number of tickets sold.
b. Graph the equation.
c. What are three possible numbers of advanced tickets and tickets sold at the door?
Homework
p. 221­222
#18­34 Evens
#42­54 Evens
#60­63 All
Quiz 4.1­4.3 on Tuesday