What is the equation of this trend line? Enter your answers by filling in the boxes
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N=M+
130
120
110-
100
90
Z 80-
70
60
50
40
30
20
10
0
+
10
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50
50
30
Variable

9

Step-by-step explanation:

Call the Total Amount of money he had X.

Amount he used to buy pens: 3/8X

Amount of money left after buying pens: X - 3/8X = 5/8X

Amount he used to buy notebooks: 2/5 * 5/8X = 1/4X

1/4X or 2/8X for 2 notebooks, so if he spent 3/8X for notebooks, he would get 3 notebooks.

As a notebook cost 3 times a pens, so for 3/8X money, he bought 9 pens.