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anonymous

  • 4 years ago

Solve this system of equations: 2x - 5y =1 4x + 2y = 14

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  1. Hero
    • 4 years ago
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    2x-5y = 1 4x+2y = 14 y = (1-2x)/-5 y = (14-4x)/2 y = y 2(1-2x) = -5(14-4x) 2 -4x= -70+20x 72 = 24x 72/24 = x x = 3 y = 1

  2. anonymous
    • 4 years ago
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    Whay do you multiply it my -5 and 2?

  3. Hero
    • 4 years ago
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    Because I crossed multiplied by fractions I created once I isolated y

  4. anonymous
    • 4 years ago
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    why do you cross multiply?

  5. Hero
    • 4 years ago
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    Because I set two fractions equal to one another. I set them equal to each other because they are expressions that represent intersecting lines. The goal is to find the (x,y) point where they intersect. Setting the expressions equal to each other is and finding the (x,y) points is like graphing both lines to find the point, except one is an algebraic method and the other is a graphic method.

  6. anonymous
    • 4 years ago
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    oh, thank you. :D

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spraguer (Moderator)
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