• Choice D
    51. In the standard (x,y) coordinate plane below, point A has coordinates (2,−4), and point B(8,−1) divides AC ___ so that the ratio AB:BC is 1:3. What are the coordinates of point C ?

    AB:BC=1:3

    =>ABAC=14

    ADAE=ABAC=14

    ADAE=14

    82AE=14=>AE=4×6=24

    Therefore, the x coordinate of C is 2+24=26.

    DBEC=ABAC=14

    DBEC=14

    3EC=14=>EC=12

    Therefore, the y coordinate of C is -4+12=8.

    The coordinates of point C is (26,8).

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