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Suchal Riaz

area of rectangle = x * y
y=mx + c
m=-0.75 and c=12
so y=12-0.75x
now back to area:
Area = x*y
=x*(12-0.75x)
=12x- 3/4 x²
proved.

Suchal Riaz

i don't know about markscheme as you did not attach it and i don't know which past paper has this question.

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