exam Maths Puzzle Numerical Ability

Find an equation of the line containing the points (4,9) and (-1,8)

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how do I solve this question: (3.99-X)/3.5=1.35 please help me. i cant figure out how to do this. thank you for your time in trying to figure this out!
compare the graph of the function with the graph of f(x)=square root x.
y=-squarerootx