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Week 8 Test[1] math day 7

Week 8 Test[1] math day 7 - MAT106 Chapters 7-8 Cumulative...

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MAT106 Chapters 7-8 Cumulative Test NAME: There are 20 questions for this test, and each question is worth 5 points. To show your  work, use EE or MT and, where necessary, rewrite equations in slope-intercept form. If  you provide only the answer and show no work, no points will be earned. 1. Find the slope and the  y -intercept. y  = 7 x ANS: Y-intercept is (0,0), Slope = 7 At the y-intercept, x = 0 y=7(0) y=0 Y-intercept is (0,0) Slope = 7 2. Write the equation of the line with slope  1 2 -  and  y -intercept (0, 3).  Then graph the line. ANS: 1 3 2 Y X = - + Y = mx + b Where m is the slope, and b is the y-intercept 1 y=- 3 2 . 0: 1 0 3 2 1 3 2 2 1 2 ( )( ) 3( ) 1 2 1 6 (6,0) x When y x x x X + = = - + = = = Page 1 of 20

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-8 -6 -4 -2 2 4 6 8 -8 -6 -4 -2 2 4 6 8 x y 3. The equation  y  = 2 x  – 70 describes the amount of money a class of students might earn from  candy bar sales.  What are the slope and  y- intercept of this line? ANS: slope = 2, y-intercept (0,-70) Y = mx + b Where m is the slope, and b is the y-intercept slope = 2, y-intercept (0,-70) 4. Determine which two equations represent parallel lines. (a)   y  = 3 x  – 7 (b)   y  = –3 x  + 7 (c)   y  = 3 x  + 5 (d)   y  =  1 3 - x  – 7 ANS: (a)y=3x-7, and (c)y = 3x +5 Parallel lines have equal slopes.  Therefore the two equations that represent parallel lines are : y = 3x -7,  and y = 3x + 5 Page 2 of 20
5. Determine which two equations represent perpendicular lines.

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Week 8 Test[1] math day 7 - MAT106 Chapters 7-8 Cumulative...

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