MATHEMATICS · Multi-part · A Level · Mathematics · Coordinate geometry in the (x y) plane · Coordinate geometry in the (x y) plane
Problem
A straight line is given by y=−7x+26. Use the equation to answer the following questions.
(i) State the slope and the y-intercept of the line.
(ii) Calculate the x-intercept of the line.
(iii) On graph paper, choose a suitable scale so that both intercepts are visible, and sketch the line, marking the intercepts clearly.
(iv) Using your graph, estimate the value of y when x=5.5 and state the method you used to obtain this estimate.