exam Maths Puzzle Numerical Ability

Equations: express it in standard form. Can someone Help me to understand the steps envolved, Thanks!

With m = -1 and y-intercept (0,5)

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A (0,4) B (7,1) find AB Hello
I have another one for you. I have the answer but I cannot remember how I came to have it. Would you be able to help me get there, as I am not certain that it is correct any