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2 years ago

2) 4x - y = 7 -4x + y = -7 I need helpppp

Mathematics

1 answer:

Molodets [167]2 years ago

5 0

Answer:

(0,-7)

Step-by-step explanation:

4x - y = 7

-y = -4x + 7

y = 4x - 7

-4x + (4x - 7) = -7

-4x + 4x - 7 = -7

x = 0

4(0) - y = 7

-y = 7

y = -7

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If John has $400 in his savings account. If he spends $50. how much will his account decrease?

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Answer:

Step-by-step explanation:

it will decrease by 50 dollar which makes it 350

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2 years ago

A scale model of a rectangular building lot measures 7feet by 5 feet. If the actual house will be built using a scale factor of

Tamiku [17]

Actual area of the rectangular building = 5040 feet²
Step-by-step explanation:
Length of the rectangular building = 7 feet
Width of the rectangular building = 5 feet
Now, The building is made with a scale factor of 12
So, Actual length of the rectangular building = 84 feet
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2 years ago

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barxatty [35]

Answer:

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Step-by-step explanation:

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$y=Ae^{-rt}$

Where:

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Hence, the decay rate/factor is 0.05

#Alternatively

The exponential decay can be of the form:

$y=ab^x$

Where:

y is the size at time x, a is the initial size, x is time and b is the decay factor.

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2 years ago

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Sergio [31]

Answer:

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Step-by-step explanation:

Given that:

$Cosec (t) = -\frac{13}5$

for $\pi < t < \frac{3 \pi}2$

That means, angle $t$ is in the 3rd quadrant.

To find:

Value of cot(t)

Solution:

First of all, let us recall what trigonometric ratios are positive and what trigonometric ratios are negative in 3rd quadrant.

In 3rd quadrant, tangent and cotangent are positive.

All other trigonometric ratios are negative.

Let us have a look at the following identity:

$cosec^2\theta -cot^2\theta =1$

here, $\theta =t$

So, $cosec^2t-cot^2t=1$

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2 years ago

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babunello [35]

Answer:

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3 years ago