2 . The equation of a straight line L
1 is given as 2x� y� 20 � 0 .
( a ) Write down the gradient and the y -intercept of L
1
.
( b ) Find the equation of another straight line L
2 such that L
2 is
[ 2 ] perpendicular to L
1 and they intersect at the y -axis, giving the answer in general form . [ 3 ]
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