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3 years ago

Solve the system of equations. (HINT: use the elimination method) 7x+4y=2 9x-4y=30

Mathematics

1 answer:

igor_vitrenko [27]3 years ago

4 0

Answer: 7x + 4 y = 2

9x - 4y= 30

-------------------

16x / = 32

x= 32:16

x=2

Step-by-step explanation: 7x+4y=2

7*2 + 4y=2

14 +4y=2

4y= 2-14

4y= -12

y= -12 : 4

y= - 3

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Answer:

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Step-by-step explanation:

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3 years ago

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Tanya [424]

Answer:

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3 years ago

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Arte-miy333 [17]

Answer:

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3 years ago

2. Use the following picture for this question:

Art [367]

Answer:

a. $24\sqrt{3}$ and 41.6

b. 52.1

Step-by-step explanation:

Considering the left side triangle the blue dotted side is the side "opposite" to the angle given and the side 24 is the side that is "adjacent" to the angle given. The trigonometric ratio tan relates opposite to adjacent. Also, let the blue dotted side be y.

<u>Note:</u> the exact value of tan 60 is $\sqrt{3}$

Thus, we can write $Tan(60)=\frac{y}{24}\\y=24*Tan(60)\\y=24*\sqrt{3} \\y=24\sqrt{3}$

Approximate value (rounded to nearest tenth): $24\sqrt{3} =41.6$

Considering the triangle to the right, the side "opposite" to the angle given (53 degrees) is 41.6 (just found in part (a)) and the side "hypotenuse" (side opposite to 90 degree angle) is x. The trigonometric ratio sine relates opposite and hypotenuse.

Thus we can write and solve:

$Sin(53)=\frac{41.6}{x}\\x=\frac{41.6}{Sin(53)}=52.1$

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3 years ago

Find the slope and y-intercept? Please help<br> y = -2x - 1

PtichkaEL [24]

Answer: Slope is -2 and y int: -1

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It was in your equation m=-2 and -1 being y intercept

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3 years ago

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