Help please I don't get this

Mathematics

2 answers:

jeka57 [31]3 years ago

4 0

Which one is it, 3 or 4

DiKsa [7]3 years ago

3 0

3.
y vaires directly as x means
y=kx
where k is a constant
given
y=8 and x=-6
8=-6k
divide both sides by -6
8/-6=k
-4/3=k
so
y=-1.33x
2nd option

4.
y=kx
y=mx+b
k would be the slope or rise/run
it rises 1 and travels 4 from (0,0) to (1,4)
slope or constant of variation is 1/4

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Which is a simplified form of the expression 5x – 12 + 18x – 4?

Veseljchak [2.6K]

<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ You may have forgotten to add the options

However, you can collect like terms

In other words, collect the 'x' values and collect the numbers

5x + 18x = 23x

-12 - 4 = -16

Thus, your answer would be 23x - 16.

Any further questions, let me know.

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4 0

4 years ago

Read 2 more answers

Find all solutions of the equation in the interval [0, 2π). 2cosθ+ 1= 0

zlopas [31]

Hello!

$\large\boxed{\frac{2\pi}{3} \text{ and } \frac{4\pi}{3}}$

2cosФ + 1 = 0

Begin by isolating for cosФ. Subtract both sides by -1:

2cosФ = -1

Divide both sides by 2:

cosФ = -1/2

Using the unit circle, we know that from [0, 2π), values that have a cosine of -1/2 are 2π/3 and 4π/3.

Therefore, the solutions of this equation are:

Ф = 2π/3 and 4π/3

5 0

3 years ago

PLEASE HELP!!

Marysya12 [62]

The first system of equations has infinite solutions because you can write one equation as a linear combination of the other.The second system of equations has no solution because mathematically an incoherence results -14 = -2 / 7I attach the solutions for greater understanding.
x-4y=12; 5x-20y=60 --> infinitely many
y-7x=-14; 7y-49x=-2 --> none