The line with gradient 2 passing through the point P(3t, 2t) intersects the x-axis at A and

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The line with gradient −2 passing through the point P(3t, 2t) intersects the x-axis at A and the y-axis at B.

i. Find the area of triangle AOB in terms of t.
The line through P perpendicular to AB intersects the x-axis at C.

ii. Show that the mid-point of PC lies on the line y = x.

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