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Sagot :

Answer:

f(x) = -4x + 21

Step-by-step explanation:

use the points to find the slope:

[tex](y_2-y_1)/(x_2-x_1)\\\\=(13-5)/(2-4)\\\\=8/(-2)[/tex]

slope is -4

y = -4x + b

plug in one of the available points to find b, let's use (4, 5):

5 = -4(4) +b

5 = -16 + b

b = 21