book Maths Puzzle Numerical Ability

what is the slope of the graph of this linear equation in two variables

3y + 18x = 21

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book Other Question

Calculate the return A if the bank compounds daily (n=365)
20,000 & 8% (n=365)
This is what I have so far:
A= 20,000 ( 1+.08/365) 365*3
A= 20,000 (1.00)^1095
= ?

Thanks, Christine study time/ test score
15 60
21 68
28 66
33 73
38 77
40 74
43 80
46 95
*how do i construct a scatt