The value of y varies directly with x, and y = −12 when x = 6. Find y when x = −4. A. −8 B. 8 C. 24 D. −24
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RO divides the rectangle into two congruent right triangles.
The area of the one triangle is equal half area of the rectangle.
Calculate the area of rectangle:
The area of right triangle:
Use the Pythagorean theorem to calculate the length of RO:
The formula of an area of this right triangle is:
Therefore we have the equation:
