A suitable calculator finds the determinant to be ...
... B. -203
_____
This can be calculated by hand by copying the first two columns to the right of the given matrix, then forming the sum of products of the downward diagonals and subtracting the sum of products of the upward diagonals.
... (-4)(3)(-5) +(-4)(-5)(-5) +(-3)(3)(2) -(-5)(3)(-3) -(2)(-5)(-4) -(-5)(3)(-4)
... = 60 -100 -18 -45 -40 -60
... = -203
-4X-18 Is your correct answer
Answer:
204 R45
Step-by-step explanation:
Replace x with 3 and y with 6 and see which equation is true.
A) y = 7x - 15
6 = 7(3) - 15
6 = 21 - 15
6 = 6
The point (3, 6) makes the first equation true, so the answer is A). Point (3, 6) does not make any other choice a true equation. Answer is definitely A).
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