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anonymous

  • 5 years ago

Can someone explain the substitution method for literal equations?

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  1. amistre64
    • 5 years ago
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    do you have n example we can work thru?

  2. anonymous
    • 5 years ago
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    Hold on

  3. anonymous
    • 5 years ago
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    x - y = 4 4y - x = 14

  4. amistre64
    • 5 years ago
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    to substitute means to replace with an equal value right?

  5. amistre64
    • 5 years ago
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    x-y = 4 ; lets solve for x by +y to each side x-y+y = 4+y x+0 = 4+y x = 4+y ; this is an equal value for x; we use it in the other equation now

  6. anonymous
    • 5 years ago
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    The 3 rules I have are 1. Solve one of the equations for x or y 2. Substitute this expression into the other equation and solve for one unknown. 3. Place this value back into one of the equations and determine the other unknown.

  7. amistre64
    • 5 years ago
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    4y - x = 14 4y -(4+y) = 14 ; distribute the - thru the (...) 4y -4 -y = 14 ; +4 to each side 4y -4+4 -y = 14+4 4y -y = 18 ; add your y's together 3y = 18 ; solve for y by /3 to each side y = 6

  8. amistre64
    • 5 years ago
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    since y = 6 is a solid value; we can use it in our equation to find x recall that: x = 4+y ; and we now know that y = 6 x = 4+6 = 10

  9. amistre64
    • 5 years ago
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    you can put it back into another equation if you want, but why bother with that since you already found an equation for x :)

  10. anonymous
    • 5 years ago
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    Thanks again!

  11. amistre64
    • 5 years ago
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    youre welcome...again :)

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