exam Maths Puzzle Numerical Ability

Please help solve the following questions from ch. 5 exersie 5.5
thanks,
Sarah

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exam Other Question

I HOPE U CAN HELP ME WITH THIS. WRITE AN EQUATION OF A LINE THAT SATISFIES THE GIVEN CONDITIONS. WRITE THE ANSWER IN SLOPE-INTERCEPT FORM.

THE LINE PASSES THROUGH THE POINTS (2,5) AND (8,-5) please help me with this problem.
simplify. sq rt 500