8x-5y=21 simultaneous linear equation 2x+9y=-5

Question

8x-5y=21 simultaneous linear equation
2x+9y=-5

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Amelia 3 weeks 2021-12-26T10:03:55+00:00 1 Answer 0 views 0

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    2021-12-26T10:05:17+00:00

    Answer:

    x=2 and y=-1

    Step-by-step explanation:

    If two equations are given, we can solve one of the equation in terms of single variable and put it in the other equation which will further give the value of x and y.

    For the given equations:

    8x-5y=21              Equation:1

    2x+9y=-5             Equation:2

    Solving equation multiply equation 2 with 4 on both the sides

    8x+36y=-20        Equation 3

    Subtracting Equation:3 from Equation:1

    8x-5y-(8x+36y)=21-(-20)\\8x-5y-8x-36y=21+20\\-41y=41\\y=-1

    Putting value of ‘y’ in Equation:2 which will give the value of x

    2x+9y=-5\\2x+9(-1)=-5\\2x-9=-5\\2x=4\\x=2

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45:7+7-4:2-5:5*4+35:2 =? ( )