exam Maths Puzzle Numerical Ability

Problem 16 that i got wrong

Find the slope of any line perpendicular to the line through points (0,5) and (-3, -4)

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exam Other Question
Can you help me solve.

4x^4 - 3xy^3 when x = -1 and y= -2

thanks plot the graph of the equation 2x+4y=10 and 3x+6y=12, and interpret the results