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ira [324]
4 years ago
11

Solve the system algebraiclly 3x -2y -1 = 0 y= 5x +4

Mathematics
1 answer:
Andreyy894 years ago
3 0
You’re already given what y is so just substitute it in and solve

3x-2(5x+4)-1=0
Distribute
3x-10x-8-1=0
Add like terms
-7x-9=0
Add 9 to both sides
-7x=9
Divide both sides by -7
x=-9/7
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Answer:

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Step-by-step explanation:

change 7% to decimal = .07

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3 years ago
Use trig identities to transform the left side of the equation to the right side.
Taya2010 [7]

<u>Answer and explanation</u>

(1+sinθ)(1-sinθ)=cos²θ

We are to prove that the left hand side is equal to the right hand side.

(1+sinθ)(1-sinθ) = 1(1-sinθ) + sinθ(1-sinθ)

                         = 1 - sinθ + sinθ - sin²θ

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From the trigonometric identity sin²θ + cos²θ = 1,

1 - sin²θ = cos²θ


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may be this helpfulness!

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