exam Maths Puzzle Numerical Ability

How would I write the equation of the line passing through (4,4) and (4,2)?

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exam Other Question

For what value of y does (4,1-y) = (4,y-3)?

a.2 b.4 c.3 d.-2
Solve by the substitution method.

7m + n= 12
m - 8n= 18

Help me please. This chapter is just aweful for me I understand hardly anything.