book Maths Puzzle Numerical Ability

please help me with this problem, I am confused...

y-b=x
---
m

y minus b over m equals x

thank you
John

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book Other Question

give 2 points on the line with the givin equation, then graph the line.
y=-4x+6

i dont no how 2 do any of this Express the interval as an inequality in the variable x. (-4.-1)