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2 years ago

Solve the system using subtitution 3x + 2y = 23 1/2x - 4 = y

Mathematics

1 answer:

olasank [31]2 years ago

8 0

Answer:

y=6

Step-by-step explanation:

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Can someone PLEASE help me solve this equation ? due soon

RideAnS [48]

$\sf{Given : 3tanx + 7 = \dfrac{2}{(1 - sinx)(1 + sinx)}}$

We know that : (a - b)(a + b) = a² - b²

$\implies \sf{3tanx + 7 = \dfrac{2}{1 - sin^2x}}$

We know that : 1 - sin²x = cos²x

$\implies \sf{3tanx + 7 = \dfrac{2}{cos^2x}}$

$\sf{\bigstar \ \ We \ know \ that : \boxed{\sf{\dfrac{1}{cos^2x} = sec^2x}}}$

$\implies \sf{3tanx + 7 = 2sec^2x}$

We know that : sec²x = 1 + tan²x

$\implies \sf{3tanx + 7 =2(1 + tan^2x)}$

$\implies \sf{2 + 2tan^2x - 3 tanx - 7 = 0}$

$\implies \sf{2tan^2x - 3 tanx - 5 = 0}$

$\implies \sf{2tan^2x - 5tanx + 2tanx - 5 = 0}$

$\implies \sf{2tanx(tanx + 1) - 5(tanx + 1) = 0}$

$\implies \sf{(tanx + 1)(2tanx - 5) = 0}$

$\implies \sf{tanx = -1 \ (or) \ tanx = \dfrac{5}{2} }$

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2 years ago

Simplify<br> 7^8x7^3x7^4/7^9x7^5

MArishka [77]

Please take a photo of this problem... it looks very hard when it is written in the way you did.

<h3>If I am reading this correctly the answer should be 1,977,326,743x^3</h3>

3 0

3 years ago

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Solve for x<br> 3/10 = x/7<br> Give your answer as an improper fraction in its simplest form!!!!!

julsineya [31]

Answer:

x = 21/10

Step-by-step explanation:

3/10 = x/7

Cross multiply.

10x = 21

x = 21/10

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2 years ago

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Stacy owes $40 on her credit card. After she made a payment, her new balance was $10. What was the amount of her

Yakvenalex [24]

Answer:

Step-by-step explanation:

x + 40 = 10

x = -30

She paid $30 on her credit card

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2 years ago

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3^x= 3*2^x<br> solve this equation

densk [106]

Answer:

${3}^{x} = 3 \times {2}^{x} \\ x = \frac{ln(3)}{ln(3) -ln(2) } = \frac{1.09}{1.09 - 0.69} \\ x = 2.7$

I hope I helped you^_^

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2 years ago