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alexira [117]
3 years ago
5

Solve the system of equations using substitution.

Mathematics
1 answer:
faltersainse [42]3 years ago
6 0

Answer:

( \frac{1}{3}, 3 )

Step-by-step explanation:

Given the 2 equations

y = 9x → (1)

6x - y = - 1 → (2)

Substitute y = 9x into (2)

6x - 9x = - 1, that is

- 3x = - 1 ( divide both sides by - 3 )

x = \frac{1}{3}

Substitute x = \frac{1}{3} into (1) for corresponding value of y

y = 9 × \frac{1}{3} = 3

Solution is ( \frac{1}{3}, 3 )

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Need help on question 5 please help
blagie [28]

Answer:

  $66

Step-by-step explanation:

It can be convenient to assign a different variable to the amount of money each spent. We can call the amounts spent by Seedevi, Georgia, and Amy "s", "g", and "a", respectively.

The problem statement tells us ...

  s = (1/2)g

  s = a +6

  s + g + a = 258

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The problem statement asks for the amount Seedevi spent, so we need to find the value of s. It is convenient to write the other variables in terms of s:

  g = 2s

  a = s -6

Then the sum is ...

  s + (2s) +(s -6) = 258

  4s = 264 . . . . . . . . . . . add 6, simplify

  s = 66 . . . . . . . . . . . . . .divide by 4

Seedevi spent $66.

4 0
3 years ago
Two numbers 60 and n have LCM of 420. If n is a multiple of 6 less than 90,find the possible value of n
Ber [7]
Lcm of 60 and n = 420
Stated: n <90 and a multiple of 6

420/60 = 7 thus n must be a multiple of 7
Therefore n =42 or 84
3 0
3 years ago
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Leviafan [203]

Answer:

not sure

Step-by-step explanation:

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6 0
2 years ago
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alexdok [17]

Answer:

17

Step-by-step explanation:

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7 0
3 years ago
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MA_775_DIABLO [31]

Answer:

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