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3 years ago

I need help what is 3-2y+(-8y)+7.8

Mathematics

2 answers:

Snowcat [4.5K]3 years ago

6 0

Answer:

10.8-10y OR -10y+ 10.8

Step-by-step explanation:

sO: 3-2y-8y+7.8

3-10y+7.8

10.8-10y / -10y+10.8 Either one

Veseljchak [2.6K]3 years ago

6 0

Changes made to your input should not affect the solution:

(1): "7.8" was replaced by "(78/10)".

STEP
1
:

39
Simplify ——
5
Equation at the end of step
1
:

39
(3 - 10y) + ——
5
STEP
2
:
Rewriting the whole as an Equivalent Fraction

2.1 Adding a fraction to a whole

Rewrite the whole as a fraction using 5 as the denominator :

3 - 10y (3 - 10y) • 5
3 - 10y = ——————— = —————————————
1 5
Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

2.2 Adding up the two equivalent fractions
Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

(3-10y) • 5 + 39 54 - 50y
———————————————— = ————————
5 5
STEP
3
:

Pulling out like terms :

3.1 Pull out like factors :

54 - 50y = -2 • (25y - 27)

Final result :
-2 • (25y - 27)
———————————————
5

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i'll give brainliest plss help!!!Paul earns money each week for mowing his lawn. He earns a flat rate lawn and earns an extra $1

guajiro [1.7K]

ANSWERS

(a) x represents the number of hours and y represents Paul's earnings.

(b) y - 24 = 1.50(x - 6)

(c) y = 1.50x + 15; b represents the flat rate

EXPLANATION

(a) In linear models, the x-variable is usually the independent variable, while the y-variable is the dependent variable. In this problem, we know that Paul's earnings depend on how many hours of additional yard work he does. Hence, the x-variable represents the number of hours Paul does extra yard work and the y-variable represents his earnings.

(b) A linear equation in point-slope form is,

$y-y_1=m(x-x_1)$

Where m is the slope and (x₁, y₁) is a point on the line.

In this case, we know that Paul earns an extra $1.50 per hour for additional yard work. If the additional yard work time in hours is represented by the x-variable, then the slope is 1.50.

Now, we need a point on the line. This is given in the problem, where it is said that when Paul worked 6 hours, he earned a total of $24. So the point is (6, 24),

$y-24=1.50(x-6)$

Hence, the equation in point-slope form is y - 24 = 1.50(x - 6).

(c) The slope-intercept form of the equation of a line is,

$y=mx+b$

We have to take the equation found in part (b) and rearrange it to find the equation in this form.

To do so, apply the distributive property to 1.50 on the right side of the equation,

$\begin{gathered} y-24=1.50x-1.50\cdot6 \\ \\ y-24=1.50x-9 \end{gathered}$

And add 24 to both sides,

$\begin{gathered} y-24+24=1.50x-9+24 \\ \\ y=1.50x+15 \end{gathered}$

The value of b is 15. Remember that b is the y-intercept, which is the value of the function when x = 0. This means that y = 15 when x = 0 and, therefore, 15 is the flat rate.

Hence, the equation in slope-intercept form is y = 1.50x + 15, and the y-intercept, b, represents the flat rate Paul earns without doing any extra work.

7 0

1 year ago

Please can you answer both questions Will mark brainiest

Finger [1]

Answer:

130

Step-by-step explanation:

Because I solved it and I got that as an answer

hope this helps you :DDD

3 0

3 years ago

Kkkkkkkkkkkkkkkkkkkkkkkk

Aloiza [94]

The formula for slope is y = mx + b
y is the y value, m is the slope, x is the x value, and b is the y intercept.

The equation given for line e is
$y = \frac{ - 9}{2} x + 7$
Therefore the slope of line e is -9/2
Line f is parallel and parallel lines have the same slope.

So the slope is line f is -9/2.

The picture isn't that clear and I can't really tell if it's-9/2 or 9/2.
But whatever it is, the slope of line f is the same as the slope of line e because they are parallel.
Good luck!

8 0

4 years ago

What is the equation of a line that passes through the point (5, −4) and is parallel to the line whose equation is 2x + 5y = 10?

dybincka [34]

What you should do first is simplify the equation into the y = mx + b format. Move 2x to the other side. Know that in doing this, 2x must become the opposite of what it currently is (-2) in order for the equation to remain true. We also have to take away the '10' because the line is parallel, not exactly the same, which means a different y intercept. This looks like:

$5y = -2x + b$

Next, simplify y to make things easier. This can be done by dividing both sides by 5, like so:

$\frac{5}{5}y = -\frac{2}{5}x + b$

What you should also know is that if a line is parallel to another, then this means the slope has to be the same because they both have the same changes in rise and run. With this in mind, simply plug in the x and y values.

$(-4) = -\frac{2}{5} * (5) + b$