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anonymous

  • 5 years ago

11x + 3y = 20 3x + y = 4 Using the two equations above, solve for x.

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  1. anonymous
    • 5 years ago
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    its either x = 7 x = 5 x = 4 x = 9

  2. anonymous
    • 5 years ago
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    we-write 2nd equation as y=4-3x. plug in thi into the 1st equation. u get the x value.

  3. anonymous
    • 5 years ago
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    i have no idea how to do the problem can u just give me the answer please (:

  4. anonymous
    • 5 years ago
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    i better give u the way how to do it first. so u learn how to do problem like this. :)

  5. anonymous
    • 5 years ago
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    okay, but idk what you mean by plug it in to the equation

  6. anonymous
    • 5 years ago
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    idk how to do problems with two unknowns

  7. anonymous
    • 5 years ago
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    u have y=4-3x. so u substitute the y in the 1st equation as 4-3x st: 11x + 3y = 20 ---> 11x + 3(4-3x) = 20 solve the new equation to get x

  8. anonymous
    • 5 years ago
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    if u need to find both unknown. like in this case, after u get the x, substitute the value of x into any of the equation, then solve it to get the value of y.

  9. anonymous
    • 5 years ago
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    idk im just gonna guess i have no idea how to do it

  10. anonymous
    • 5 years ago
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    it was 4 (:

  11. anonymous
    • 5 years ago
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    i got it right

  12. anonymous
    • 5 years ago
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    thanks

  13. anonymous
    • 5 years ago
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    yes. x=4.

  14. anonymous
    • 5 years ago
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    u r welcome.

  15. anonymous
    • 5 years ago
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    You must understand what these equations represent. Suppose you are given two equations in this form and are asked to solve for x and y: 11x + 3y = 20 ---------------- equation 1 3x + y = 4------------------------equation 2 Equations 1 and 2 represent two straight lines on a graph which has an x axis and a y axis. You are trying to find the point of intersection of these two lines on the graph. You can try it out using a graph paper and you will find the correct answer of the intersection point, namely (x,y)

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