exam Maths Puzzle Numerical Ability

I really understand these type of problems, could you help me with this...

find the slope of the line 3x=4y+1

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exam Other Question

find the slope and the y-intercept.
y=6x+1 This problem is not from my textbook it is a worksheet problem.
Use Descartes�s rule of signs to discuss the possibilities for the roots of the equation.
4x3-9x2+2x+3=0