a straight line passes through two stations with map refrenece x
(-2,7) and Y(6,-1) respectively. A spur line is to be built from a
smelting works b(8,9) to the line T. To minimise costs the spur line
BT is to be as short as possible.
a) find the equation of XY
b) find the equation of BT
c) the coordinates of T
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