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3 years ago

5u+5(1-u)=u+8 I need help finding the answer

Mathematics

1 answer:

vfiekz [6]3 years ago

6 0

I hope this helps you

5u+5-5u=u+8

5-8=u

u=-3

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Step-by-step explanation:

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2 years ago

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Answer: Last Option

$x=2,\ y=-5$

Step-by-step explanation:

Cramer's rule says that given a system of equations of two variables x and y then:

$x =\frac{Det(A_X)}{Det(A)}$

$y =\frac{Det(A_Y)}{Det(A)}$

For this problem we know that:

$Det(A) = |A|=\left|\begin{array}{ccc}4&-6\\8&-2\\\end{array}\right|$

Solving we have:

$|A|= 4*(-2) -(-6)*8\\\\|A|=40$

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Solving we have:

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$Det(A_Y) = |A_Y|=\left|\begin{array}{ccc}4&38\\8&26\\\end{array}\right|$

Solving we have:

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