3x − 6y = −12 −x + 2y = 8
2 answers:
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D. 
Take each term and find the degree of the term and then put them in order from highest to lowest:
x=1
Remember a letter without an exponent is assumed to be a 1.
Hope that helps.
Take each term and find the degree of the term and then put them in order from highest to lowest:
x=1
Remember a letter without an exponent is assumed to be a 1.
Hope that helps.
Answer:
(-2)
Step-by-step explanation:
We have to find the determinant of the given matrix,
det A = (a - 1)(a² + a + 1) - (a + 1)(a² - a + 1)
= a(a² + a + 1) - 1(a²+ a + 1) - a(a² - a + 1) - 1(a² - a + 1)
= a³ + a² + a - a² - a - 1 - a³ + a² - a - a² + a - 1
= (a³ - a³) + (-a² + a² - a² - a²) - 1 - 1
= -2
Therefore, determinant of the given matrix is (-2).