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ss7ja [257]
3 years ago
6

Help and explain pls and thankyouu

Mathematics
1 answer:
defon3 years ago
5 0

Hello,

1)

\left\{\begin{array}{ccc}2x-y&=&7\\-2x+3y&=&9\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}2y&=&16\\-2x+3y&=&9\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}y&=&8\\-2x+3*8&=&9\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}x&=&7.5\\y&=&8\\\end{array} \right.\\\\

Answer C

2)

\left\{\begin{array}{ccc}x-2y-3z&=&5\\x+2y+3z&=&7\\x+z&=&3\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}2x&=&12\\x+2y+3z&=&7\\x+z&=&3\\\end{array} \right.\\\\\\\left\{\begin{array}{ccc}x&=&6\\2y+3z&=&1\\z&=&-3\\\end{array} \right.\\\\\\\\\left\{\begin{array}{ccc}x&=&6\\y&=&5\\z&=&-3\\\end{array} \right.\\\\\\

Answer C

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Write an equation of a line parallel to the line y=-2x+8 and passes through the point (-1,-3)​
saul85 [17]

Answer: y=–2x–5

Step-by-step explanation:

The equation of a straight line:

y=mx+c

m must be the same for the two lines to be parallel.

y=mx+c

y=–2x+8 → m=–2

For a new equation:

x=–1, y=–3, m=–2, c=?

y=mx+c → –3=–2×(–1)+c

–3=2+c

c=–5

So:

y=–2x–5

5 0
3 years ago
Can someone will give brainlist
Xelga [282]

Answer:

45 %

Step-by-step explanation:

8 - 20     will get you across IF it is NOT a prime

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4 0
3 years ago
Spencer has two tapes of different color for decoration. His red tape measures 5/6 of a yard, and his green tape measures 1/3 of
Lady_Fox [76]
Given from the question
first fraction = 5/6
second fraction = 1/3

We're asked what's the difference between the fraction

First, we need to equalize the denominator to the same number. The first denominator is 6, the second denominator is 3. I'd like to make them both 6. So the second denominator needs to be multiplied by 2, so does the numerator
second fraction = 1/3
second fraction = (1 × 2)/(3 × 2)
second fraction = 2/6

Second, we have new fractions which have the same denominator. Calculate the difference
d = first fraction - second fraction
d = 5/6 - 2/6
d = 3/6

The red tape is 3/6 yard more than the green tape.
6 0
4 years ago
A company rents out 13 food booths and 27 game booths at the county fair. The fee for a food booth is $50 plus $6 per day. The f
Stella [2.4K]

Answer:

2000 + 321d

Step-by-step explanation:

It is stated that there are 13 food booths and 27 game booths.

The fee for a food booth is a flat 50 dollars. There are 13 food booths. SO

13 x 50 = 650 -----> This is one part of our expression.

Next, it is 6 dollars per day per food booth, and there are 13 food booths. SO

13 x 6d =78d   (Note that it says that D can be used for the number of days)

Next, we need to solve for the game booths. A game booth also has a flat fee of 50 dollars. There are 27 of them.

50 x 27 = 1350 -----> This is the second part of our equation.

Next we need to calculate the amount per day per game booth.

9d x 27 = 243d. Putting all of these together, we get ---->

1350 + 650 + 243d + 78d

Adding all these up together, we get:

2000 + 321d

Note: I double checked my work, put a comment if you want me to show my double checking. ALSO Moderators, please don't delete this answer. It took a lot of work to make it. It would also help if you give me brailiest.

6 0
3 years ago
A toy jeep is 12 1/2 inches long, while the actual jeep measures 18 3/4 feet long. What is the value of the ratio of the length
Kryger [21]
17 and 1/4 yayayayay

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4 years ago
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