2 1/4 pounds of chocolate cost $9.00. What is the price per pound?
2 answers:
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Answer:
Area = 21 unit²
Step-by-step explanation:
We have one point of triangle = (0,0)
The other points can be solved, intersection means
−3x²+20 = x²−16
4x² = 36
x² = 9
x = ±3
when x = 3, y = 3²−16 = 9 -16 = -7 , point is (3,-7)
when x = -3, y = (-3)²−16 = 9 -16 = -7 , point is (-3,-7)
We need to find area of triangle with points (0,0), (3,-7) and (-3,-7).
Area of triangle is given by
Area = 21 unit²