exam Maths Puzzle Numerical Ability

How do I graph this?
y ≤ -x+18
x ≥ 4
y ≥ 3

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exam Other Question

How do you graph the following:
y= 0.5x(squared) - 2.24x - 1.4
AND
y= 0.08x(cubed) - 1.62x(squared) + 6.72x 24 the length of a rectangle is 3 cm longer that twice the width. The area of the rectangle is 90 sq cm. Find the length and width of the rectangle.