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strojnjashka [21]
4 years ago
9

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

Mathematics
1 answer:
zmey [24]4 years ago
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
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3 years ago
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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:

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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}

Now, in Quadrant II,

  • The x-axis is negative
  • The y-axis is positive

Therefore, the Adjacent angle to \theta_1 =-\sqrt{15}

Therefore:

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

8 0
4 years ago
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Answer:

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Step-by-step explanation:

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