exam Maths Puzzle Numerical Ability

Write the equation of the line passing through (4, 4) and (4, 2).

A) y = 4 B) y = -2x C) x = 4 D) y = x + 4

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exam Other Question
A certain radioactive element decays to 1/2 of its original amount every 20 years. If there was 100mg to start with, how much will be present after 200 years? Set up an equation and solve the problem. Can someone please help me ?? Please help me to do this equation

Determine which two equations represent parrallel lines

A) Y= 5/3x +4 b) y= -3/5x -7 c) y=2x+8 d) y= 2x-4

Please let me know how to do this

Thanks