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Ratling [72]
3 years ago
11

Evaluate this expression: 3x + 9x -5

Mathematics
1 answer:
Margarita [4]3 years ago
5 0

Answer:

12x - 5

Step-by-step explanation:

3x + 9x - 5 can be easily simplified by combining like terms.

3x and 9x are like terms because they both contain the same variable and the same exponent (understood to be 1).

Therefore, because an addition sign separates the two terms, it is expected of you to add the two together. To do this, just add the terms together as you would any other terms.

3x + 9x = 12x

Because the 5 is the only constant in the equation, it cannot be combined with anything else.

The simplified expression is 12x - 5.

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X + y = 3<br> 3x + 2y = 14
d1i1m1o1n [39]

<em><u>The solution is x = 8 and y = -5</u></em>

<em><u>Solution:</u></em>

<em><u>Given system of equations are:</u></em>

x + y = 3 ------ eqn 1

3x + 2y = 14 ------ eqn 2

We have to find the solution to the equations

We can use substitution method to solve

From eqn 1,

x + y = 3

Isolate for "x"

x = 3 - y ------ eqn 3

<em><u>Substitute eqn 3 in eqn 2</u></em>

3(3 - y) + 2y = 14

9 - 3y + 2y = 14

-y = 14 - 9

-y = 5

<h3>y = -5</h3>

<em><u>Substitute y = -5 in eqn 3</u></em>

x = 3 - (-5)

x = 3 + 5 = 8

<h3>x = 8</h3>

Thus the solution is x = 8 and y = -5

3 0
4 years ago
What is the x, y, and z for this question?
Monica [59]

Answer:

x= -2

y=0

z= 1

Step-by-step explanation:

{-x+5y-10z=-8

2x-y+10z=6}

{2x-y+10z=6

-7x-3y-10y=4}

{-x+5y-10z=-8

2x-y+10z=6} = x+4y=-2

{2x-y+10z=6

-7x-3y-10y=4} = -5x-4y=10

{x+4y=-2

-5x-4y=-10}. =. y= 0 x= -2

substitute x and y in -x+5y-10z=-8

-(-2)+5(0)-10z=-8

solve for z

z= 1

(x,y,z) = (-2,0,1)

hope this helps

4 0
3 years ago
Sun body please help me ASAPPPP
Fittoniya [83]

Answer:

0.0132575758

Step-by-step explanation:

8 0
3 years ago
Can you explain how it o write an equation for a line that goes through points on a table?
hjlf
Hello! hope this makes sense

4 0
3 years ago
Read 2 more answers
Please help me out it would be greatly appreciated
Dmitry_Shevchenko [17]

The area of the given parallelogram is 120.

Step-by-step explanation:

Step 1:

The parameters needed to determine the area of a parallelogram are the base length and height.

The base length of this parallelogram is 15 inches while its height is 8 inches.

The area of a rectangle is determined by multiplying the base length with the height.

Step 2:

The area of the parallelogram = (b)(h).

Here the base length is 15 inches and the height is 8 inches.

The area of the parallelogram =(15)(8) = 120.

So the area of the given parallelogram is 120.

5 0
3 years ago
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