Math help

How would you solve these systems? I need help

1. X=3
2x-4y=5

2. X=3
4y=2x+18

3. Y=3
4y=2x+18

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  1. 1. Plug x = 3 into the equation 2x - 4y = 5 and solve.
    Do the same for 2 and 3.

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  2. It's substitution

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  3. I know it is but how would you do that's what I'm asking.

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  4. If you know that x = 3 for example
    Then use 3 instead of x in the next equation
    and all will be well.

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    posted by Damon

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