exam Maths Puzzle Numerical Ability

Can someone show me how to write the mapping rule that shows the transformation of y=2^x for the equation 1/4(y-5)=2^(x-3)?

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exam Other Question

Graph the inequality 3x-4y is less than 12 The area of a triangle is 20 cm2. The height of the triangle is 3cm more than its base. Find the base of the triangle.

(A=1/2 b x h)

x = base
x + 3 = height
20 = (1/2x) (x + 3)