find the angle between x axis & line joining (2,-1) &(4,-3).

Thus, angle between x-axis and the line is 135°.

  • 11

180

  • -6

m(slope of a line)= change in y/ change in x
m= (-3+1)/(4-2) = -2/2 = -1

therefore, angle = tan-1(-1) = -45o .

  • -5
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