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jas asked in Science & MathematicsMathematics · 1 decade ago

solve the system using substitution: 3x^2 - 2y^2=1 4x - y = 3?

i can solve this sytem using the addition method but am having trouble using substitution if anyone could please show the method i would appreciate it

3 Answers

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  • 1 decade ago
    Favorite Answer

    3x^2 - 2y^2=1

    4x - y = 3

    from second y=4x-3

    substitute y in first equation

    3x^2-2(4x-3)^2=1

    3x^2-32x^2+48x-18-1=0

    29x^2-48x+19=0

    solve for x and result x1 and x2 then compute y1 and y2

    System have 2 solutions because a straight line cut a hyperbola in 2 points in this case

    B. If your system is

    (is not clear if it's 14 0r 1 and 4 to second equations)

    3x^2 - 2y^2=14

    x - y = 3

    then

    3x^2-2(x-3)^2=14

    x^2+12x-32=0

    idem solve for x1 and x2 then y1,y2 .....

  • ?
    Lv 4
    4 years ago

    First, for between the equation resolve for x in terms of y or y in terms of x. right here i will resolve for y based on the 1st equation: y = 4x-3. Now plug that throughout to the 2d equation for y: 9x-2(4x-3)=10. Distribute: 9x-8x+6=10. Simplify: x=4. Now plug that into the two equation to resolve for y or to keep a while basically use the equation we derived for y interior the 1st step: y=4x-3=4(4)-3=sixteen-3=13. a answer might desire to fulfill the two equations. you could plug in x=4 and y=13 into the two equations to get actual statements, i.e. 3=3 and 10=10 after some simplifying. in spite of the shown fact that, utilising x=a million and y=a million satisfies the 1st equation yet no longer the 2d as a results of fact 7 would not equivalent 10. the respond is (4, 13). desire this helps!

  • Anonymous
    1 decade ago

    3x^2 - 2y^2=1

    4x - y = 3

    Solve equation 1 for y.

    -y=3-4x

    y=-3+4x

    Substitute -3+4x for y in equation 1.

    3x^2 - 2y^2=1

    3x^2 - 2(-3+4x)^2=1

    Solve

    3x^2+6-8x^2=1

    9x+6-64x=1

    -55x+ 6=1

    -55x=-5

    x=11

    Substitute 11 for x in equation 1.

    4x - y = 3

    4(11) - y = 3

    Solve

    44-y=3

    -y+44=3

    -y=-41

    y=41

    The answer is (11, 41)

    Source(s): Algebra student.
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