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sonja_lee2

  • 3 years ago

what is the y-coordinate of the solution of the system of equations? 3x+2y=-25 -x+y=0

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  1. ChmE
    • 3 years ago
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    solve the second equation for x. Let me know what you get..

  2. sonja_lee2
    • 3 years ago
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    idk....

  3. ChmE
    • 3 years ago
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    if you add something to each side of an equation does anything really change, besides the way the equation looks?

  4. sonja_lee2
    • 3 years ago
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    no

  5. ChmE
    • 3 years ago
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    7x=7 if x=1 then this equation is true, correct? if we add 3 to each side 7x+3=10 and x is still 1, the equation is still true just looks different

  6. sonja_lee2
    • 3 years ago
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    oh okay

  7. ChmE
    • 3 years ago
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    we want to get x by itself and positive the easiest way to do that is to add x to each side of the equation. y - x = 0 y - x + x = 0 + x

  8. ChmE
    • 3 years ago
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    y=x or x=y doesn't matter how you write it

  9. ChmE
    • 3 years ago
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    Now that we know this. we can substitute the x's for a y. This is called the substitution method. 3(y) + 2y = -25 Now solve for y

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