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EastWind [94]
3 years ago
10

Which expression is equal to 5x(m-n) 1. (m-5)x(n-5) 2. 5m-5n 3. m-5n

Mathematics
2 answers:
vitfil [10]3 years ago
5 0
#2. 5m-5n would be the equal expression
Flauer [41]3 years ago
4 0
5m-5n
Multiply each term in the parentheses by 5
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Subtitute 2x+y=7 and 3x-y=8
iogann1982 [59]

Answer:

x = 3 , y = 1

Step-by-step explanation:

2x + y = 7

3x + y = 8

solution

2x + y = 7-----------(1)

3x - y = 8------------(2)

from equation 1

2x + y = 7

y = 7 - 2x-------------(3)

substitute equation 3 into equation 2

3x - y = 8

3x - (7 - 2x) = 8

3x - 7 + 2x = 8

3x + 2x = 8 + 7

5x = 15

divide through by the coefficient of x

5x/5 = 15/5

x = 3

to find y

substitute x into equation 1

2x + y = 7

2(3) + y = 7

6 + y = 7

y = 7 - 6

y = 1

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3 years ago
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A= (a+b/2) × h

Is the formula for a trapezoid
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