SAT数学备考经典模拟题训练23

>>SAT数学模拟题：SAT数学备考经典模拟题训练23

>>SAT考试辅导

5. What is the simplified result of following the steps above in order?

(1) add 5y to 2x

(2) multiply the sum by 3

(3) subtract x + y from the product

A. 5x + 14y

B. 5x + 16y

C. 5x + 5y

D. 6x + 4y

E. 3x + 12y

6. If the equation of a line p in the coordinate plane is y = 3x + 2, what is the equation of line q which is a reflection of line p in the x-axis?

A. y = -3x + 2

B. y = -3x - 2

C. y = 3x - 2

D. y = -1/3x - 5

E. y = -1/3x + 5

5.Correct Answer: A

Explanation:

Step one 2x + 5y

Step two 3(2x + 5y) = 6x + 15y

Step three (6x + 15y) - (x +y) = 6x + 15y - x - y (watch that last minus sign!)

This gives 5x + 14y

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