What is the value of x in the equation x – y = 30, when y = 15?
4
8
80
200
2 answers:
<u>Answer:</u>
45
<u>Step-by-step explanation:</u>
We are given an equation <em>x - y = 30 </em>which we are to solve for x when the value of y is 15.
To solve this linear equation for x, we just need to substitute the given value of y into the equation to get the value of x.
x - y = 30
x - 15 = 30
x = 30 + 15
x = 45
Therefore, the value of x is 45 when y = 30.
Unfortunately this value is not in the given options but 45 is the correct answer.
<em>There are many ways of solving the set of equations x + y = 30 and x - y = 2 for x and y.
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</em>
<em>From x +y = 30 we get x = 30 - y
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<em>Now substitute this in the equation x - y = 2
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<em>30 - y - y = 2
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<em>-2y = -28
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<em>
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<em>y = 14
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<em>As x = 30 - y = 30 - 14 = 16
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<em>
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<em>The required solution of the set of equations is x = 16 and y = 14</em>
<em>Toodles~</em>
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