exam Maths Puzzle Numerical Ability

Can someone please help me on this problem?

I need to find the slope of the line through the following pairs of points:

(-5, -3) and ( -5, 2)

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exam Other Question

Find the maximum value of C = x + 3y on the region determined by the constraints
{3x + 2y <= 16
{0<= x <= 4
{0<= y <= 5

Possible answers:

10
17
19
21
One number is five more than another number. Their sum is 285. what are they?

5x+x=258
6x=258
6x/6=258/6
x=47.5

5x
5(47.5)
237.5