Math

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the graph line passing through (1,1) , (-2,4) make with positive x-axis angle equal is:

a) 30 degree
b) 45 degree
c) 60 degree
d) 135 degree

• Math -

slope = (4-1)/(-2-1) = -1

If Ø is the angle that the line makes with the x-axis, then
tanØ = -1
Ø = 135°

(draw the line to verify)

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