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3 years ago

Use substitution to show that 9+ 6(10-7x) is equivalent to 69-42x.

Mathematics

2 answers:

larisa86 [58]3 years ago

6 0

Answer: 9 + 6(10- 7x) = 69 - 42x

Step-by-step explanation:

9 + 6(10- 7x)

we open the bracket first

9 + 60 - 42x

69 - 42x

Therefore the two equations are equivalent

we can also check by substituting a number, lets say x = 1

9 + 6[10 - 7(1)] = 69 - 42(1)

9 + 18 = 69 - 42

27 = 27

OverLord2011 [107]3 years ago

5 0

9 + 60 -42x
9+60 = 69
= 69- 42x

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Step-by-step explanation:

Given that:

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A = {1, 4, 2, 2, 3, 1, 1, 2, 1}

Rearranging A : 1, 1, 1, 1, 2, 2, 2, 3, 4

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B = {1, 4, 2, 2, 3, 1, 1, 2, 1, 9}

Rearranging B = 1, 1, 1, 1, 2, 2, 2, 3, 4, 9

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Q1 of A = 1/4(11) = 2.75th tetm = (1 + 1)/ 2 = 1

Q3 of A = 3/4(11) = 8.25th term = (3+4)/2 = 3.5

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