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Alchen [17]
3 years ago
13

Solve the system of linear equations by elimination. 4x+3y= -5 -x+3y= -10

Mathematics
1 answer:
Georgia [21]3 years ago
5 0

4x + 3y =  - 5 \\ x - 3y = 10 \\  \\ 5x = 5 \\ x = 1 \\  \\ 4 + 3y =  - 5 \\  \:  \: 3y =  - 9 \\ y =  - 3 \\  \\ (1 \:  - 3)
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3 years ago
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den301095 [7]

Hi there! In this problem, you should have the knowledge of three basic Trigonometric Ratio.

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  • cosA = adjacent/hypotenuse
  • tanA = opposite/adjacent

Now that we know three basic ratio. Let's check each choices!

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This choice is wrong because we focus on the 50° angle. When we focus on 50°, sin50° should be d/x and not d/c.

  • sin50° = c/x

This choice is also wrong because in ratio, it's cos50° that adjacent/hypotenuse.

  • tan50° = d/c

This choice is correct! As ratio states, tanA = opposite/adjacent.

  • tan50° = x/c

This choice is wrong. x/c is a reciprocal of cosine which is 1/cos. We call the reciprocal of cosine as secant or sec in short.

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This choice is right by the ratio. Nothing really much to explain since we follow by ratio that is defined.

Answer

  • tan50° = d/c
  • cos50° = c/x

Questions can be asked through comment.

Furthermore, tan also has its reciprocal form itself which is called cotangent also known as cot in short.

Hope this helps, and Happy Learning! :)

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3 years ago
A company is expanding its building area from 14,000 square feet to 17,640 square feet. What is the percentage increase of the a
natali 33 [55]

Answer:

its about 7.9% I think .... ............

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