exam Maths Puzzle Numerical Ability

Could I get help on working out this problem?
Find the slope and y intercept by writing the equation in slope intercept form then graph the equation.
-4x-3y=6

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exam Other Question

"Your grades are 76, 90, 85 and 87. If the next grade received counts twice, what grade do you need to maintain an average of 84 in the class?" Please help me solve for x on this equation: (x^2-6)^2-6x(x^2-6)+5x^2=0