If the value of "y" Varies directly with "x" and y = -8 when x = 20, find "y" if x = -4.
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Answer:
(1, 3) and (4,0)
Step-by-step explanation:
The quadratic function is
We can rewrite in the form
The graph is obtained by shifting the parent quadratic function 3 units right and 1 unit down to obtain the parabola shown in the attachment.
The straight line also have equation
The slope is -1 and y-intercept is 4.
We can easily graph this straight line on the same graph as shown in the attachment.
The two graphs intersected at (4,0) and (1,3).
The solution set is therefore {(x,y)|x=4,y=0 or x=1,y=3}
