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svet-max [94.6K]
3 years ago
9

5x – 2y = 1 x + 3y = -7 How to solve by substitution

Mathematics
1 answer:
Katen [24]3 years ago
4 0

Step-by-step explanation:

substitute x for 3 and y for 7

5×3-2y=1

15-2×7=1

15-14=1

substitute y for -5 and x for 8

8+3×-5=-7

8+-15=-7

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Please help me with this math problem!! Will give brainliest!! :)
lora16 [44]

Answer:

2x^3-3x^2-10x+15\\

Step-by-step explanation:

To find (fg)(x), we have to look at f(x) and g(x) and multiply the two quantities together. We are already given the two quantities individually so all that is left is the multiplication:

(fg)(x)=(-2x+3)(5-x^2)=-10x+2x^3+15-3x^2\\

If we reorder the terms to go from highest degree to lowest, we get our final answer to be the following:

2x^3-3x^2-10x+15

6 0
1 year ago
culture started with 3,000 bacteria. After 2 hours it grew to 3,300 bacteria. Predict how many bacteria will be present after 16
Archy [21]
7800 because it grows 300 per 2 hours so 3000 + 4800 = 7800
7 0
4 years ago
Is the sum of 3+ The Square root of 7 a rational number?
andrew-mc [135]

Answer:

yes

Step-by-step explanation: i did a test like 2 weeks ago and this was a question and i got it right

3 0
3 years ago
Multiply each polynomial <br> 1.). (x+5)(x+4)<br> 2.). (x-7)(x-4)
bija089 [108]

Answer:

1)x^2+9x+20

2)x^2-11x+28

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2 explaination: x*x+-4*x+-7*x+-7*-4=)x^2-11x+28

8 0
4 years ago
What is the answer to 284 times 45 to the power of 3
Alecsey [184]

Hey there!

284 * 45^3

= 284 * 45 * 45 * 45

= 284 * 2,025 * 45

= 284 * 91,125

= 25,879,500


Therefore, your answer is:

25,879,500



Good luck on your assignment & enjoy your day!


~Amphitrite1040:)

5 0
2 years ago
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