Answers to Homework1. 82. 233. 7/94. 13x – 35. 7x – 306. – 4x3 + x2 – 7x + 127. 488. 649. 010. x = 311. x = 2
12. x = 113. x = –6 14. x = 215. x = 1916. x = 817. x = 2518. x = –36 19. 12x + 30 = 72; x = 3.5 hrs20. 2.50x + 11 = 27; x = 6 dogs21. 36 = ½(8)(d2); d2 = 9 in22. (x) + (x+1)+(x+2)+(x+3) = 230; x = 56 #’s are 56, 57, 58, 59
Homework
Graphing Practice WorksheetReview section on graphing in summer packetPrepare questions for
“Working without graphs”“Completing tables”
Objective
Students will be able to:To graph lines from equationsDetermine the slope, x-intercept, y-intercept and equation of a line from a graph
Graphing Lines using Slope – Intercept Form (y = mx + b)
1. Write equation in slope intercept form
2. Plot y-intercept (b)3. Turn slope into fraction
if it is not already
4. Beginning at the y – int, plot 3 or 4 points using the slope
5. Draw line
5 4y x 4 5y x
41m
Graphing Lines using Standard Form (Ax + By = C)
1. Write equation in standard form
2. Find the x – intercept by making y = 0 and plot.
3. Find the y – intercept by making x = 0 and plot.
4. Connect the points in a line
6 2y x 2 6x y
2 (0) 6x 3x
2(0) 6y 6y
Special Lines Vertical
m = Undefined slopeEquation: x = #Has x – int, but no y - int
Horizontalm = 0Slope of zeroEquation: y = #Has y – int, but no x - int
Finding equations from Graphs1. Determine y – intercept
Point: (0, 3)2. Determine slope using
any 2 points on line• Slope is ¾
3. Write equation in slope-intercept form• y = ¾ x + 3
Finding equations from graphsFind:• x – intercept• y – intercept• slope• equation
(6, 0)(0, 2)
2 16 3
13 2y x
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