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a) A line #L_1# passes through point (3,3) and (5,7).Find the equation of #L_1# in the form of y=mx+c, where m and c are constants
b) Another line #L_2# is perpendicular to #L_1# and passes through (-2,3).Find i) The equation of #L_2#
ii) The x-intercept of #L_2#