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Liono4ka [1.6K]
3 years ago
7

Systems of equations by substitution

Mathematics
1 answer:
Korolek [52]3 years ago
6 0
Could you please clarify the question please by putting a question to be solved? Or are you asking for the definition?
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Ken read 30 pages of a book on monday and 1/8 of the book on tuesday, he completed the remaining 1/4od the book on wednesday.how
dlinn [17]
Let the total amount of pages be t
t=30+1/8t+2/8t
now simplify
t=30+3/8t
5/8t=30
divide 30 by 5
1/8=6
now you know 1/8 of the book is 6 pages which means the whole book has 48 pages.

7 0
3 years ago
Evaluate the following algebraic expression, if (x = 5, y = 3)<br> x² +9y - 5
gladu [14]

Answer: 47

Step-by-step explanation:

simply substitute the constants with 5 and 3.

(5)^2 + 9(3) - 5 = 47

3 0
3 years ago
Read 2 more answers
Use factoring to solve the quadratic equation x2 − 2x − 3 = 12.
melomori [17]

Answer:

x_1=5\\x_2=-3

Step-by-step explanation:

You have the following quadratic equation given in the problem:

x^{2}-2x-3=12

You must make the equation equal to zero, as following:

x^{2}-2x-3-12=0

Add like terms:

 x^{2}-2x-15=0

Now, to factor the equation, you must find two numbers whose sum is -2 and whose product is -15. Therefore, you have:

(x-5)(x+3)=0\\x_1=5\\x_2=-3

7 0
3 years ago
Read 2 more answers
When 7 is subtracted from three times a certain number, the result is 28.<br> what is the number
OverLord2011 [107]

Answer: 35/3 or 11.6

Step-by-step explanation:

3x-7=28

Add 7 to each side

3x=35

Divide by 3

6 0
3 years ago
Read 2 more answers
A fruit stand has to decide what to charge for their produce. They need $ 5 for 1 apple and 1 orange. They also need $ 15 for 3
sineoko [7]

Answer:

2 and 3

If you want to get complicated, then 2.39 and 2.61.

Step-by-step explanation:

5 = x + y

5 = 2 + 3

5 = 5

5 0
2 years ago
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