exam Maths Puzzle Numerical Ability

Will you please help me with this equation

x^2-7x+12 over x^2-16

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exam Other Question

Find the x and y intercepts of 8x-8y=-9
Choices are:

x=9/8 y=-9/8

x=8/9 y=-8/9

x=-8/9 y=8/9

x=-9/8 y= 9/8 Can someone hlep me on this problem?

In planning for a new item, a manufacturer assumes that the number of items produced x and the cost in dollars C of producing these items