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amid [387]
4 years ago
7

4x + 2y = 2 2x + y = 4 Step by step explanation please

Mathematics
2 answers:
k0ka [10]4 years ago
8 0

Step-by-step explanation:

by using substitution method

4x+2y=2-----i

2x+y=4-------ii

make y the subject of the formula in equation ii

2x+y=4

y=4-2x------iii

substitute equation iii into equation i

4x+2y=2

4x+2(4-2x)=2

4x+8-4x=2

collect like terms

4x-4x=2-8

0=-6

actually they're no solutions to this simultaneous equation

Harlamova29_29 [7]4 years ago
4 0

Answer:

No solutions

Step-by-step explanation:

4x + 2y = 2

2x + y = 4

we need to evaluate for y is "2x + y = 4" to be able to solve this.

2x + y = 4

2x - 2x + y = 4 - 2x

y = -2x + 4

4x + 2y = 2

4x + 2(-2x + 4) = 2

4x -4x + 8 = 2

8 = 2

NO solutions

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Burka [1]
Answer:
question (1)
height of building = 308 ft
question (2)
cos 67.11 = 7/18

Explanation:
question (1)
Taking a look at the triangle, we can see that it is a right-angled triangle. This means that we can apply the special trigonometric identities.
The one we will use here is:
tan Θ = opposite / adjacent 
where:
Θ = 72
the opposite side is the height of the building
the adjacent side = 100 ft
Substitute to get the height as follows:
tan(72) = height / 100
height = tan(72)*100 = 307.76 which is approximately 308 ft

question (2):
We are given that:
cos Θ = 7/18
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A circle is centered at (5, −9) and has a radius of 12. Which of the following is the equation for this circle? (x − 5)2 + (y +
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Answer:

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