exam Maths Puzzle Numerical Ability

celsius temperature readings can be converted to fahrenheit reading using the formula F = 9/5C + 32. What is the fahrenheit temperature that corresponds to each of the following celsius temperatures: -10, 0, 15, 100?

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exam Other Question
y=(y2 - y1 / x2 - y1)x+b

If you could please show the steps to how you solved this I would appreciate it.

Thanks Find the graphic solution to the following system of equations:
y=2x+5 and y-x=4