book Maths Puzzle Numerical Ability

Write the equation of the line with slope 4 and y-intercept (0, -5). Then graph the line

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book Other Question

y^4 -3y^3 -2y^2 +10y -12=0 ; 1+i

one of these is the answer, which one is it:

(1 + or - i, -2,3) ; (+ or - 1, + or - 2, + or - 3, 4) ; (+ or - 2, + or - 4)
what is the gradient of a line on a graph that is parallel to y=3x?