exam Maths Puzzle Numerical Ability

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

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

Thanks

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exam Other Question

I am a little lost on this expression. Divide and simplify
{{{(x^2-49)/x}}}/{{{4f/(25f-125)}}} 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?