book Maths Puzzle Numerical Ability

how do i graph these equations on paperby plotting points and connecting the points to make a line

1. y= -x
2. y= x-1
3. y= -x+2
4. y= 2x+1

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book Other Question

the volume of a cylinder is given by V=pie r^2h where r is the radius of hte cylinder and h is the height of the cylinder. Suppose the volume of hte can is 121 cubic centimeters Write the equation of the line with slope 4 and y-intercept (0, -5). Then graph the line