Substitution Method PART 2

Substitution Method PART 2

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What is the value of y?

2x + 3 = y, when x = 4

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What is the value of x?

6y - 3 = x when y = 4

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What is the value of x?

12 - y = x when y = 8

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What is the value of y?

y = -3x + 3 when x = -1

​y = 2x

3x + 3y = -18

Which variable is solved for?? ​

We don't have any values given to us this time!​

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Substitute that value into the other equation & solve.

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​y = 2x

3x + 3y = -18 -->

​3x + 3(2x) = -18

​We replaced the value of "y" into the other equation.

​x = 8y

5x + 5y = 0 -->

​5(8y) + 5y = 0

​We replaced the value of "x" into the other equation.

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Set this up:

x = 6y

-5x + 5y = 25

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Set this up:

-5x + 2y = 7

y = 6x

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Set this up:

y = 2x

6x + 7y = 20

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Set this up:

x = -8y

2x + 4y = 0

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Set this up:

x + 7y = -44

y = 3x

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Set this up:

x = 5y

2x + 2y = 4

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Set this up:

x = 2y

-2x + 3y = 18

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Set this up:

y = -3x

-6x + 3y = 15

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Set this up:

8x + 4y = -12

x = -2

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Set this up:

2y + 12x = 30

x = -3

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Set this up:

x = 6y

x + 2y = 36

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Set this up:

x = 3y

x + y = 4