4 years ago

Solve 8x+7y=5; 4x-9y=65 using matrices Im soo bad at this stuff haha

1 answer:

8 0

I hope I did not make any mistake but this is a god procedure to solve it, reduce ur matrice to row echelon and you can easily get ur answer I did not have pen ans paper with me so i just try to do it briefly on paint, regards.

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The children sold lemonade for 25 sense a cup they sold 40 cups how much money did they earn

jekas [21]

Do you mean 25 cents?
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Murrr4er [49]

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The angle \theta_1θ 1 theta, start subscript, 1, end subscript is located in Quadrant \text{II}IIstart text, I, I, end text, a

andrew11 [14]

Answer:

$\cos(\theta_1)=-\dfrac{\sqrt{15}}{4}$

Step-by-step explanation:

The angle $\theta_1$ is located in Quadrant II.

$\sin(\theta_1)=\dfrac{1}{4}$

From trigonometry, we know that:

$\sin(\theta)=\dfrac{Opposite}{Hypotenuse}\\$Therefore:\\Opposite=1\\Hypotenuse=4\\Using Pythagorean theorem:\\Hypotenuse^2=Opposite^2+Adjacent^2\\4^2=1^2+Adjacent^2\\Adjacent^2=16-1\\Adjacent^2=15\\Adjacent=\sqrt{15}$