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3 years ago

16x+4(x-5) I had to do 20 characters

Mathematics

2 answers:

Murljashka [212]3 years ago

6 0

Step-by-step explanation:

16x+4x-20=0

20x-20=0

bring -25 to other side it will become 25

20x=20

x=20/20

x=1

salantis [7]3 years ago

5 0

Answer:

x=1

Step-by-step explanation:

<u>Distribute to simplify parenthesis:</u>

16x+4x-20

<u>Combine like terms:</u>

20x+20

<em>Theoretically, there is an invisible =0 in this expression, so we subtract 20 from both sides</em>

<u>Subtract:</u>

20x+20=0 ⇒ 20x=20

<u>Divide both sides by 20</u>

x=1

i hope this helps u pls give a brainliest and a thx ;)

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Answer:

I cannot answer all of this, so I will only answer what I can:

Q1: 13

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3 years ago

Use the graph below to estimate the solution to the system of equations shown.

Mila [183]

Answer: The second choice is answer.

Step-by-step explanation:

<h3>The first line (Blue One)</h3>

$y=-x-3$ (Slope is -1 and intercepts y at -3)

<h3>The second one (Red One)</h3>

$y=2x-8$ (Slope is 2, to find y-intercept. Substitute x = 0 then we get -8) (For x-intercept, it's 4. Just substitute y=0 to get x-intercept.)

Because there are choices, it's easy to notice.

The first one, x = -4 and almost -5 which is not right. (x is around 1 almost 2.)

The second one, x = 1 and almost 2 is right.

The third one, x = -1 and almost -2 is not right (The intersection isn't even at -1 or any negative number for x-axis.)

The fourth one, just like the first one... x = 4 almost 5

<h3>Or solve the equations.</h3>

$y=-x-3\\y=2x-8$

Substitute y=2x-8 in y=-x-3

$2x-8=-x-3\\2x-8+x+3=0\\3x-5=0\\3x=5\\x=\frac{5}{3}\\(x=1\frac{2}{3})$

Look at the value of x then find the answer that matches the value of x.

Now for y, substitute x = 5/3 in y = -x-3 (or in 2x-8 if you want.)

$y=-\frac{5}{3} -3\\y=-\frac{5}{3} -\frac{9}{3} \\y=-\frac{14}{3} \\(y=-4\frac{2}{3} )$

So the answer is the second choice.

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3 years ago