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30 January, 03:47

X+y=525 3x+7y=2775

A. 340

B. 280

C. 225

D. 300

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Answers (1)
  1. 30 January, 04:02
    0
    Answer: C. 225

    Step-by-step explanation: for this case we need to calculate the value of x, to complete this we have 2 equations,

    you can stat with simple equation X+y=525, if you clear x we get the following equation.

    x = 525 - y

    after that we are going to replace x in the major equation.

    3x + 7y = 2775

    After replace x we get the following equation

    3 * (525 - y) + 7y = 2775

    after that, the 3 is going to multiply each value into the parenthesis

    3 * 525 - 3 * + 7y = 2775

    after resolve the product we get the following equation

    1575 - 3y + 7y = 2775

    you need resolve the equation with values which has the y

    getting the following result

    1575 + 4y = 2775

    after that you pass the 1575 to the other side with the sign of subtraction

    4y = 2775 - 1575

    4y = 1200

    after that, the 4 which is multiplying pass to the other side dividing

    then

    y = 1200/4

    y = 300

    finally, you will replace the value of y in the equation where we clear x, this equation.

    x = 525 - y

    if you replace y

    x = 525 - 300

    x = 225

    then value of the x is 225
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