exam Maths Puzzle Numerical Ability

Given the following points, find the slope of the line through these points. (-3,0) and (2,-1)

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exam Other Question

I am having trouble turning this equation into a table. y=-1/2x-4
The table has a few numbers in it and when I look at it I just get confused.
Here is the table

x , y
? , -1
-2 ,?
? ,-4
2 ,?

Please help! Solve the system by addition

5x-4y=-5
x-2y=-7

Please help solve this