exam Maths Puzzle Numerical Ability

Would someone please help me through these two please?

"Use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real o

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exam Other Question
Find the slope and y-intercept of the equation


y = 1/2x - 4 To find the distance to the nearest hundredth between the points (-6-5) and (-1,3) do I start by using -6 and -1 as my X and -5 and 3 as my y?
thank you