Y=x^2-4x+8 and 4x+y=12 so y=12-4x, insert y in the quadratic to get
12-4x=x^2-4x+8
12=x^2+8
0=x^2-4=(x-2)(x+2)
So the solutions are x=2 and x=-2.
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If using a calculator, you can calculate one number as a percentage of another by dividing the numbers and multiplying by 100.
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b or c I'm not for sure
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hope this helps
Answer:
1. 2.8 2. 1.24 3. 1.75 4. 2.375
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