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Class 10MathematicsPair of Linear Equations in Two VariablesAlgebraic methods: Substitution method and Elimination method.Medium
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If 5x + 2y = 28 and 7x - 3y = 19, what is the value of 2x - y?

Answer and explanation

Correct answer: 143/29

Use elimination to solve the simultaneous equations before evaluating the requested expression. Multiply 5x + 2y = 28 by 3 to obtain 15x + 6y = 84. Multiply 7x - 3y = 19 by 2 to obtain 14x - 6y = 38. Adding gives 29x = 122, so x = 122/29. Substitution in the first equation gives y = 101/29. Hence 2x - y = 2(122/29) - 101/29 = 143/29. The originally supplied key and choices were inconsistent with the equations, so option A has been corrected to the verified value. The other numerical choices do not satisfy the calculated expression.

Related tags

Linear-EquationsElimination-MethodAlgebraic-ExpressionAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathematicsClass 10 Mcq
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10 more MCQs
  1. 1In the equation \(2x-y=4\), what is the value of \(y\) when \(x=3\)?
  2. 2Which equation is obtained by simplifying (6x+3y=12)?
  3. 3What is the point of intersection of the lines \(4x+3y=34\) and \(4x-y=10\)?
  4. 4If the lines \(x+y=9\) and \(kx+3y=23\) both pass through the point \(\left(4,5\right)\), what is the value of \(k\)?
  5. 5While solving a pair of linear equations in two variables by the elimination method, in which situation can one variable be eliminated directly?
  6. 6What is the \(x\)-coordinate of the point of intersection of the lines \(4x+5y=31\) and \(3x-2y=1\)?
  7. 7If the two lines have a unique point of intersection (r, s) that satisfies 3r + s = 19 and r − s = 1, what is the value of r + s?
  8. 8The unique point of intersection of two lines is (r, s). If the lines are represented by 4r + s = 29 and r − s = 1, what is the value of r + s?
  9. 9What is the solution of the equations (x+y=5) and (x-y=1)?
  10. 10In the equations (2x+y=7) and (x=2), what is the value of (y)?
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