exam Maths Puzzle Numerical Ability

Use the mapping rule method to sketch the graph of the following function:
y=2(3)^(-x+1)+4
What is the Transformational Form:
Write the mapping rule:
Show the table of values:

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exam Other Question
The vertices of a triangle are P (-1,-1) Q(2,1) and R (3,-1). Find the equation of the altitude of the triangle PQR from Q. How do i figure out 2(x+4)-5(x-3)=18