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bixtya [17]
3 years ago
11

He simultaneous equations5x + y = 21x - 3y = 9 With working out​

Mathematics
1 answer:
Elza [17]3 years ago
8 0

Answer:

see explanation

Step-by-step explanation:

Given the 2 equations

5x + y = 21 → (1)

x - 3y = 9 → (2)

Multiply (1) by 3 and add the result to (2) to eliminate y term

15x + 3y = 63 → (3)

Add (2) and (3) term by term

(x + 15x) + )- 3y + 3y) = (9 + 63)

16x = 72 ( divide both sides by 16 )

x = 4.5

Substitute x = 4.5 into (1) for corresponding value of y

22.5 + y = 21 ( subtract 22.5 from both sides )

y = - 1.5

Solution is (4.5, - 1.5 )

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2. "Eight more than the quotient of a number<br> and -5 is less than or equal to 6."
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Answer:     $8 + \frac x{-5} \leq 6$

Step-by-step explanation:

Just translate it word-for-word.

"Eight" :   8

"more than" :   +

"quotient of" :   /

"a number" :   x

"-5" :   -5

"is less than or equal to" :   \leq

"6" :   6

6 0
2 years ago
Carmine paid an electrician x dollars per hour for a 5-hour job plus $70 for parts. The total charge was $320. Which equation ca
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4 years ago
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wariber [46]
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Hope this helps!!
6 0
3 years ago
IS THE ANSWER C 162 ?? someone check me please this is triangular prism correct??? I did 1/2 × 6×3×18 but someone else got 243 a
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Answer:

the answer is c 162

Step-by-step explanation:

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substitute the values into the formula:

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plz vote my answer the brainiest if it helps, thanks!

4 0
3 years ago
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