x- and y- intercepts
DESCRIPTION
X- and Y- Intercepts. Objective: To identify the x- and y- intercepts. Standard 6.0. Return Quizzes. Any questions? 13 total points 2 extra credit points for last question. Intercepts. X-Intercept: where the line crosses the x-axis ordered pair: (x,0) - PowerPoint PPT PresentationTRANSCRIPT
X- and Y- Intercepts
Objective: To identify the x- and y- intercepts.
Standard 6.0
Return Quizzes
Any questions? 13 total points 2 extra credit points for last question
Intercepts
X-Intercept: where the line crosses the x-axis ordered pair: (x,0)
Y-Intercept: where the line crosses the y-axis Ordered pair: (0,y)
Y-intercept
X-intercept
Example 1 State the x- and y- intercepts
x-intercept:
y-intercept:
(-4,0)
(0,2)
TOO State the x- and y- intercepts
x-intercept:
y-intercept:
(3,0)
(0,6)
Example 3 State the x- and y- intercepts
x-intercept:
y-intercept:
(5,0)
none
Will this vertical line ever cross
the y-axis?no
Cover up Method!
If an equation is in standard form
ax + by = c a,b,c are all #’s
Cover up method: To find x-intercept, cover up the y To find y-intercept, cover up the x
Example: 5x + 4y = 20
y-intercept: (0,5)
x-intercept: (4,0)
Examples 5 & 6
6x + 3y = -18y-intercept: (0,-6)
x-intercept: (-3,0)
x – 4y = 14y-intercept: (0,-7/2)
x-intercept: (14,0)
TOO
Write the x- and y- intercepts as ordered pairs
3y = 2x + 12 5x – 3y = 20
(0,4) (-6,0)20
(0, )(4,0)3
Review – Write an equation in
point-slope
(-4,3) m = 1
7
(6,-2)(5,7)
Review – Write an equation in
Standard Form
(5,-15)(11,-3) y+5 = -4(x+1)
Review – Write an equation in
Standard Form
(8,-7) m = undefined (9,-2) m = 0
Homework
Pg. 350 #19-21 a & b, 22-27 Write the intercepts as an ordered pair
X-intercept: (#,0) Y-intercept: (0,#)
Monster Problem Time!!