book Maths Puzzle Numerical Ability

How would I right an equation of the line perpendicular to the line
l: y=-1/4x+2 and passes through point P(3,0)?

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book Other Question

Please help me to: write an equation for a line through (2,2), y intercept 10. Thank you. ((((((((Find a third degree polynomialwith real coefficients and with zeros 1 and 3+i.))))))))