exam Maths Puzzle Numerical Ability

Describe what the graph of interval [-4,10] looks like.

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Could someone please help me with this i forgot how you get the perimeter of a triangle.
Side 1 = 4
Side 2 = sqrt 5 - sqrt 3
Side 3 = sqrt 5 + sqrt 3
Write the equation of the line with slope -1/2 and y-intercept (0,3)
Just double checking my work


Y = mx + b
y = -1/2x +5