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1 year ago

Solve the simultaneous equations y=2-5x y = x² – 2x – 8

Mathematics

1 answer:

Aloiza [94]1 year ago

8 0

Answer:

Step-by-step explanation:

sub equation 1 into 2

2-5x=x²-2x-8

0=x²-2x+5x-8-2

0=x²+3x-10

0=(x-2)(x+5)

x=2 or x=-5

sub x into equation 1

y=2-5(2) or y=2-5(-5)

y=-8 y=27

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Answer:

Step-by-step explanation:

x- intercept is where the equation intersect the x-axis. So, at x-axis y = 0

2x + 4*0 = 20

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3 years ago

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3 years ago

Which expression is equal to 20.92 ÷ 6.8?

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Answer:

Step-by-step explanation:

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3 years ago

It is 76°f at the 6000-foot level of a mountain, and 49°f at the 12,000-foot level of the mountain. write a linear equation to f

valina [46]

Answer:

$t(x) = 103 -0.0045x$

Step-by-step explanation:

We are given the following in the question:

Let the equation:

$t(x) = a + bx$

be the linear equation that represent temperature at an elevation x.

Temperature at 6000-foot level = 76 f

$76 = a + 6000b$

Temperature at 12000-foot level = 49 f

$49 = a + 12000b$

Solving the two equation, we get,

$76-49 = -6000b\\27=-6000b\\\\b = \dfrac{-27}{6000}\\\\b = -0.0045\\76 = a + (-0.0045)6000\\76 = a -27\\a = 76 + 27\\a =103$

Thus, we can write the linear equation as:

$t(x) = 103 -0.0045x$

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3 years ago

Find the value of y so that line is passing through two points

Alenkinab [10]

Slope of a line passing through two given points
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For m=3, and substituting coordinates,
3=(1-y)/(4-1)
solve for y
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y=1-9=-8

Answer: y=-8

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3 years ago