Maths-
General
Easy

Question

1 half left parenthesis 2 x plus y right parenthesis equals 21 over 2
y equals 2 x
The system of equations above has solution (x, y). What is the value of x ?

The correct answer is: x is 21/8


    Solution:- 

    • We have given two equations

    (2x + y) = 21 over 2                      --------(1)

    y = 2x                                        --------(2)

    • We can solve this by Substitution method, Substitute value of y from equation 2 in equation 1

    2x + 2x = 21 over 2

    • Further solving we get

    4x = 21 over 2

    • Divide both sides by 4 we gwt,

    x = 21 over 8

    • Substituting value of x in equation 2 we get,

    y = 21 × 2 over 8 = 42 over 8

    • Therefore

    x=21 over 8

    y=42 over 8

    • Therefore value of x is 21 over 8.

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