P_is_the_point_(4,2),Q_is_the_point_(12,5)_and_R_i s_the_point(1,3).Calculate: 1.The_lenght_of_PR 2.The_gradient_of_PQ. 3.The_equation_of_the_line_passing_through_R_and_p arallel_to_PQ. Sorry_but_the_spacebar_isn't_working. please_help!
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Originally Posted by Crystal09 P_is_the_point_(4,2),Q_is_the_point_(12,5)_and_R_i s_the_point(1,3).Calculate: 1.The_lenght_of_PR 2.The_gradient_of_PQ. 3.The_equation_of_the_line_passing_through_R_and_p arallel_to_PQ. Sorry_but_the_spacebar_isn't_working. please_help! 1. distance formula ... $\displaystyle d = \sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2 }$ 2. slope formula ... $\displaystyle m = \frac{y_1 - y_2}{x_1 - x_2}$ 3. point-slope equation ... $\displaystyle y - y_1 = m(x - x_1)$
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