Algebra

Slove each system by substitution.

4x = y - 1
6x - 2y = -3

I have already attempted this problem and couldn't figure out what I should do.

I came out with 4x + 1 = 3x + 1.5
I think this looks right because our teacher told us that for this specific problem that we should get a decimal. But now I don't know where to go next...... Thanks!

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asked by David
  1. Solve for x. Then solve for y by substitution to either of the two equations.

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  2. I know but wouldn't you have to go through confusing fractions and multiply by fractions to get a whole number of x? I am trying to follow the teachers directions which do not include fractions.......

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    posted by David
  3. multiply the entire thing by 2 to eliminate the decimal:
    (4x + 1 = 3x + 1.5)*2
    8x-6x=3-2

    now solve for x. Then solve for y by substitution.

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  4. x = 0.5
    4x = 2
    4(0.5) = y - 1
    +1 on both sides...
    y = 3!

    Thanks!

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    posted by David

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