SAT: 1,001 Practice Questions For Dummies
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You will probably encounter some questions on the SAT Math exam that deal with systems of equations. In the following practice questions, you're given the system of equations, and you have to find the value of the variables x and y.

Practice questions

  1. Based on this system of equations, what is the value of
    SAT1001_eq1901
    7x + 3y = 4 3x + 2y = 2
  2. Based on this system of equations, what is the value of x + y?
    SAT1001_eq1902

Answers and explanations

  1. The correct answer is 1. You don't need separate values of x or y, so don't bother substituting. Simply subtract the equations and divide by 2:
    SAT1001_eq1903
  2. The correct answer is 6. Subtract the equations:
    SAT1001_eq1904
    A common denominator works, but you could also multiply everything by 6:
    SAT1001_eq1905

About This Article

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About the book author:

Ron Woldoff is the founder of National Test Prep, where he helps students prepare for the SAT, GMAT, and GRE. He is the author of several books, including GRE For Dummies and 1,001 GRE Practice Questions For Dummies.

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