exam Maths Puzzle Numerical Ability

The midpoint of a segment has coordinates M(8,2). One endpoint is A (6,0). Find the coordinates of the other endpoint.

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exam Other Question

I have a problem that I could use some help understanding how to solve/answer from a homework sheet. x varies directly with y and inversely with z. x=20 when y=8 and z=4. Find x when y=4 and z=8. Thank you Solve the following system of equations using the substitution method:
4x - y = -6
x + 2y = 3

please show work