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Algebra & Functions Flashcards

7 cards from real SAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Algebra & Functions flashcards as text

  1. If 4x + 9 = 3x + 20, what is the value of x + 1?

    Answer: 12

    Solving gives x = 11, so x + 1 = 12.

  2. A linear function has slope -2 and passes through (1, 5). What is its equation?

    Answer: y = -2x + 7

    Using y - 5 = -2(x - 1) gives y = -2x + 7.

  3. What is the product (x + 4)(x - 4)?

    Answer: x^2 - 16

    This is a difference of squares: x^2 - 16.

  4. If f(x) = x^2 and g(x) = x + 3, what is f(g(2))?

    Answer: 25

    g(2) = 5, and f(5) = 25.

  5. For what value of k does the equation 3x = k have the solution x = 4?

    Answer: 12

    Substituting x = 4 gives k = 3(4) = 12.

  6. What is the value of 2^x when x = 5?

    Answer: 32

    2^5 = 2 multiplied five times = 32.

  7. If the cost C of n items is C = 5n + 20, how many items cost $70?

    Answer: 10

    Set 5n + 20 = 70, so 5n = 50 and n = 10.