book Maths Puzzle Numerical Ability

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

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book Other Question

I am unclear as how to do this thanks for any help.
Graph the solution set of x < -4. If the system 2x-5y=1 and -3x+7y=-3 is to be solved by elimination of x, and the first equation is multiplied by 3, then by which number should the second equation be multiplied?
*I think that the answer is 2.Is this correct?