EXERCISES 73 – 75
73.The screens show the graph of one of the equations in A – D. Which equation is it?
A. B.
C. - 3 x- 2 y= 6 D. 3 x- 2 y= 6
3 x+ 2 y= 6 - 3 x+ 2 y= 6
TECHNOLOGY INSIGHTS
146 CHAPTER 3 Graphs, Linear Equations, and Functions
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–10 10
10
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10
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Segment PQ has the given coordinates for one endpoint P and for its midpoint M. Find the
coordinates of the other endpoint Q. (Hint: Represent Q by and write two equations using
the midpoint formula, one involving x and the other involving y. Then solve for x and y.)
- 71.P 1 1.5, 1.25 2 , M 1 3, 1 2 72.P 1 2.5, 1.75 2 ,M 1 3, 2 2
P 1 5, 8 2 ,M 1 8, 2 2 P 1 7, 10 2 ,M 1 5, 3 2
1 x, y 2
74.The table of ordered pairs was generated by a graphing calculator.
(a)What is the x-intercept? (b)What is the y-intercept?
(c)Which equation corresponds to this table of values?
A. B.
C. D.
75.The screens each show the graph of (which was entered as
). However, different viewing windows are used. Which window
would be more useful for this graph? Why?
A. B.
y=-x+ 15
x+y= 15
Y 1 =2X+ 3 Y 1 =-2X+ 3
Y 1 =2X- 3 Y 1 =-2X- 3
Graph each equation with a graphing calculator. Use the standard viewing window. See the
Connections box.
76.3.6x-y=-5.8 77. 5 x+ 2 y=- 10 78.0.3x+0.4y=-0.6
