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Posted by on Tuesday, August 28, 2012 at 6:33am.

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 - , Tuesday, August 28, 2012 at 8:09am

    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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