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Anestetic [448]
3 years ago
8

Find the values of a and b so that the solution of the linear system is (5,2)

Mathematics
2 answers:
True [87]3 years ago
8 0
5*a+2*b=23
5*a-2*b=7:
a=(23-2b)/5
b=(7+5a)/2:
a=(23-2*(7+5a)/2)/5
5a=23-7-5a
5a+5a=23
a=23/10
b=(7+5*23/10)/2
b=(7+23/2)/2=(37/2)/2=37
AVprozaik [17]3 years ago
7 0

Answer: a = 10 and b= 4

Step-by-step explanation:

x =5 y = 2

5a + 2b = 23-------(1)

5a - 2b = 7---------(2)

(1) -(2)

4b = 16

b = 16/4

b = 4

also, (1) + (2)

10a =30

a = 30/10

a = 3

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2 years ago
7 less than the product of a number and 8, increased by a number multiplied by 2
nataly862011 [7]

The expression for 7 less than the product of a number and 8, increased by a number multiplied by 2 is 8n-7 +2n

Given :

7 less than the product of a number and 8, increased by a number multiplied by 2

We need to write the given statement in an expression

Lets 'n' be the unknown number

the product of a number and 8

Product means multiplication

the product of a number and 8 mean n times 8 that is 8n

7 less than the product of a number and 8, subtract 7 from 8n

Expression becomes 8n-7

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So the final expression for the given statement is 8n-7 +2n

Learn more : brainly.ph/question/1023996

3 0
2 years ago
Eduardo spent half of his weekly allowance on clothes. To earn more money his parents let him wash the dog for $6.60. What is hi
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