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A) You can get this by switching the x and y values and then solving for y.
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❖ 6/10 x 5 3/4 is 3.45 or 3 9/20
Multiply:
6 23
-- x ---
10 4
Cross simplify:
3 23 69 9
-- x --- = ---- = 3 ---
10 2 20 20
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Answer: (y-c)/m
Reasoning:
Subtract c from both sides [ y-c=mx+c-c ]
Divide m from both sides [ (y-c)/m=mx/m ]
Answer:
236
Step-by-step explanation:
We assume the cost is a linear function of the number of lessons. That means the slope is the same everywhere.
Let (lessons, cost) = (x, y). We have (4, 84), (8, 160), (12, y3).
(y2 -y1)/(x2 -x1) = (y3 -y2)/(x3 -x2)
(160 -84)/(8 -4) = (y3 -160)/(12 -8)
76 = y3 -160
y3 = 160 +76 = 236
The cost will be $236 for 12 lessons.
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The cost function is ...
y = 19x +8 . . . . for x lessons
