exam Maths Puzzle Numerical Ability

How do you graph y=-4x+1?

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I hope this is the right topic! I am not sure where to start with this....

The volume of the box is represented by (x^2+5x+6)(x+5). Find the polynomial that represents the area of the bottom of the box.

Thank you in advance!
ac I don't know if this is under the correct subject.

I have to graph a piecewise function.
f(x)=
{1/2x-5}, if x < -2
{5x+4}, if x is greater than or equal to -2