exam Maths Puzzle Numerical Ability

Graph:
y= -2/3x +4 by graphing 3 points.
Thank you =)

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exam Other Question

Is the following trinomial a perfect square? why or why not
x^2+18x-81
If f(x)=x^2-6x+8, what is the value of f(7)-f(3)?

a. -1
b. 0
c. 14
d. 15
e. 16