exam Maths Puzzle Numerical Ability

Graph the function by plotting points.

f(x)=1/2x+6

plot the point (x,f(x))with an x value of -12.

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exam Other Question

28. Slope 1/2; y intercept (o, -6)

Can you please help me with this one?

Thanks
Carolyn "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?"