Step-by-step explanation:
y = 0.3x + 1
at point A(..., 9) meaning y = 9
9 = 0.3x + 1
9 -1 = 0.3x
0.3x = 9
x = 9/0.3
x = 30
A(30,9)
y = 0.3x + 1
at point B(5, ...) meaning x = 5
y = 0.3(5) + 1
y = 1.5 + 1
y = 2.5
B(5,2.5)
[tex]slope \: = \frac{dy}{dx} = \frac{y2 - y1}{x2 - x1} [/tex]
slope = (2.5 - 9)/(5 - 30)
= -6.5/25
= - 0.26
From the slope the graph is negative
