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Find the value of (x) from (4x+y=14) and (x+y=5).

Answer and explanation

Correct answer: (x=3)

The two equations describe relationships between the same two unknown numbers, x and y. Because the coefficient of y is 1 in both equations, subtracting one equation from the other removes y completely. This leaves an equation containing only x, which can be solved directly. This is the elimination method, because one variable is eliminated by combining the equations.

Subtract the second equation from the first: \(4x+y-(x+y)=14-5\). The y terms cancel, so \(3x=9\). Dividing both sides by 3 gives \(x=3\). Substitution can check it: if x is 3, then \(3+y=5\), so y is 2, and \(4(3)+2=14\). Therefore option B is correct.

Related tags

Linear EquationsEliminationValue Of XEasyClass 10

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