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3 years ago

What does k equal in kx+2y=k; if (2,-2)

Mathematics

2 answers:

Aleks [24]3 years ago

7 0

K(2)+2(-2)=k
2k-4=k
+4 +4
2k=k+4
-k -k
K=4

Debora [2.8K]3 years ago

3 0

Simplify both sides of the equation

k(2)+(2)(-2) = k

Simplify

2k-4 = k

Subtract k from both sides

2k-4-k = k-k

k-4 = 0

Add 4 to both sides

k-4+4 = 0+4

k = 4

I hope that's help !

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6^2 + x - x^2 for x=3 <br> help me pls

Stels [109]

Answer:

Step-by-step explanation:

Just insert the value of x into the equation.

x = 3 right?

6^2 + 3 - 3^2 because x = 3

36 + 3 - 9 = 39 -9 = 30

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3 years ago

Two trains leave Cleveland at the same time. One train travels east and the other travels west. The speed of the westbound train

OlgaM077 [116]

Answer:

The eastbound train travels at 92 mph and the westbound train travels at 96 mph.

Step-by-step explanation:

We know that Velocity = distance / time

If the eastbound train travels at x miles per hour, the westbound train travels at x + 4 mph.

After 3.5 hours, they are 658 miles apart. If we solve for distance the formula given above we have: Distance = velocity x time. We have that the total distance between both trains is 658 miles.

Substituting the values of the problem and solving for x we have

$658 = 3.5x+3.5(x+4)\\658=3.5x+3.5x+14\\644=7x\\92=x$

Thus, the eastbound train travels at 92 mph and the westbound train travels at 96 mph.

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4 years ago

Write a sentence that<br> represents the equation,<br> 5x + 3=28.

cupoosta [38]

Answer:

five times a number of pencils plus three pencils =twenty-eight pencils.

Step-by-step explanation:

x = 5, Have a great day!

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3 years ago

Need help plzzz???!?????!

Shkiper50 [21]

Answer:

137

Step-by-step explanation:

First start with what you know. The measure of the interior angles of a triangle total to $180^{o}$ so 51 + 2x + x = 180, then 51 + 3x = 180, 3x = 129, so