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Thepotemich [5.8K]
3 years ago
14

Simplify by combining like terms 9x-7y-3x-5y

Mathematics
2 answers:
lions [1.4K]3 years ago
6 0

Answer:

Step-by-step explanation:

6x-12y

trust me

yarga [219]3 years ago
4 0

Answer:

9x-7y-3x-5y

= 6x-12y

Step-by-step explanation:

9x and -3x are like terms as they both are "x" values

-7y and -5y are like terms as they both are "y" values

To receive the x value you subtract 3x from 9x giving you 6x

To receive the y value you subtract -5y from -7y giving you -12y

Hope that helps (:

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What is Y equals negative 2X plus 6 in standard form
Sergio039 [100]

Answer:

2x + y - 6 = 0

OR 2x + y = 6

Step-by-step explanation:

First write the equation given in the problem:

y = -2x + 6        This is in slope-intercept form (y = mx + b).

Standard form is written Ax + By + C = 0. When C is a negative number, you might also see it as Ax + By = -C.

The main difference between the two forms in that slope-intercept form isolates the 'y' whereas standard form equates to 0. Don't confuse the 'b' in standard from with the 'B' in slope-intercept form.

To convert from slope-intercept form to standard form, <u>move everything over to the side with 'y'</u>. When you move something, you do its reverse operation to the whole equation. (The reverse of addition is subtraction, the reverse of multiplication is division.)

y = -2x + 6         Do the reverse operations for -2x and +6

y + 2x - 6 = -2x + 2x + 6 - 6      Add 2x and subtract 6 on both sides

y + 2x - 6 = 0            Right side cancels out to be '0'.

2x + y - 6 = 0       Rewrite with the 'x' in front of the 'y'

Here you can see the new equation and what each variable in Ax + By + C = 0 is.

A = 2

B = 1              When a number is not written with the variable, it is 1.

C = -6

Some teachers ask it to be rewritten as Ax + By = -C when 'C' is a negative number.

2x + y = 6

8 0
3 years ago
What is the percent of change if 90 is decreased to 82
Sedbober [7]
Answer: - 8.89%

I am going to explain you in detail ir order to help you to be able to do this kind of problems by yourself.

The definition of percent change, %, is:

          change
% = ---------------- * 100
        base value

The base value is from where you start or the value for which you want to asses the variation.

So, in this case the base value is 90 (starting value).

The change is final value - initial value = 82 - 90 = - 8. The negative sign means that the value decreased.

So, following the formula you get:

         82 - 90                - 8
% =  ----------- * 100 = -------- * 100 = - 8.89
            90                     90

Answer: the percent of change is - 8.89 %, meaning that the value decreased 8.89%.
4 0
3 years ago
Read 2 more answers
Which is better buy? 5 lb of flour for $0.90 or<br> 8 lb for $1.25
Ludmilka [50]
Well let’s see if there’s a least common multiple of 5 and 8. Since 40 is the least common mult. We will multiply 40 x .90 and 40 x 1.25 . 40x.90 is 36 while 40x1.25 is 50. It’s better to buy eight pounds for 1.25!
4 0
2 years ago
Read 2 more answers
3x3 – 19x2 + kx – 30<br> What is the value of k?
Citrus2011 [14]

Answer:

Let's simplify step-by-step.

(3)(3)−(19)(2)+kx−30

=9+−38+kx+−30

Combine Like Terms:

=9+−38+kx+−30

=(kx)+(9+−38+−30)

=kx+−59

Answer:

=kx−59

6 0
2 years ago
The height of a boulder falling off a 500 meter cliff can be modeled using a quadratic equation.
Alona [7]

Answer:

The answer is t=4 s

Step-by-step explanation:

4 0
2 years ago
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