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AfilCa [17]
4 years ago
9

Can someone help me on number 9 please?

Mathematics
2 answers:
Vikki [24]4 years ago
8 0
-x+3y=0\\
2x+6y=12\\\\
-x+3y=0\\
x+3y=6\\
------\\
6y=6\\
y=1\\\\
x+3\cdot1=6\\
x+3=6\\
x=3

Minchanka [31]4 years ago
3 0
\left\{\begin{array}{ccc}-x+3y=0\\2x+6y=12&|divide\ both\ sides\ by\ (-2)\end{array}\right\\\\+\left\{\begin{array}{ccc}-x+3y=0\\-x-3y=-6\end{array}\right\ add\ sides\ of\ equations\\----------\\.\ \ \ \ \ -2x=-6\ \ \ \ |divide\ both\ sides\ by\ (-2)\\.\ \ \ \ \ \ \ \boxed{x=3}\\\\-3+3y=0\ \ \ \ \ \ |add\ 3\ to\ both\ sides\\3y=3\ \ \ \ \ \ |divide\ both\ sides\ by\ 3\\\boxed{y=1}\\\\Answer:x=3\ and\ y=1\to(3;\ 1).

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A healthy human heart beats about 1,533,000 times a year. A sparrow's heart beats about 241,776,000 times in a year. About how m
Galina-37 [17]

Answer:

About 158 times

Step-by-step explanation:

Represent the rate of human heart with H and sparrow's heart with S

H = 1,533,000\ times

S = 241,776,000\ times

Required

Determine how many times faster is S than H

To do this, we simply divide S by H i.e.

Number = \frac{S}{H}

Number = \frac{241,776,000}{1,533,000}

Number = 157.714285714

Number = 158 --- approximated

<em>Hence, the sparrow's heart beats about 158 times faster than the human hearts</em>

5 0
3 years ago
How do you model 3x= -12 using algebra tiles
alexira [117]
Use 12 to divide evenly among 3 sets. it will be 4 each set. 12 is negative, and you are dividing by a positive, so the answer will be negative (-4). 
5 0
3 years ago
6|2x+3|=36 need a mini step by step
ELEN [110]

Answer:

x=1.5

Step-by-step explanation:

We are trying to get x  by itself to see what it equals.

6(2x+3)=36

So first you want to distribute you proprieties.  You do that by multiplying 6 and 2x.  Then multiplying 6 and 3.

12x+18=36

Now in equations where you need to find the variable, whatever you  do on one side of the equal sign, you have to do on the other side.  So now we want to subtract 18 from both sides.

12x+18=36

     -18  -18

Then we divide 12 from both sides.

12x=18

÷12   ÷12

Now you have your answer!

x=1.5

6 0
3 years ago
60
DedPeter [7]

 Expression for percent of survey participants who chose fishing =

Explanation:

 Total number of boys = 60

 Number of boys who took part in survey = 18 + 29 =47

 Number of boys who chose fishing = 29.

 Percentage of an outcome = (Number of favorable outcome/ Total number of outcome) x 100

 Percentage of boys who chose fishing = (29/47)x100

 Expression for percent of survey participants who chose fishing =

Hope I helped! :)

4 0
3 years ago
Read 2 more answers
How to write 720,981 in word form!
ohaa [14]

Answer:

seven hundred and twenty thousand, nine hundred and eighty-one

Step-by-step explanation:

8 0
3 years ago
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