i-Ready Diagnostic Test Diagnostic Algebra and Algebraic Thinking 3

Question 1

Which table of values represents the linear equation y = 2x − 1?

Accepted Answer

x=1→1, x=2→3, x=3→5

Answer

Using y = 2x − 1: when x=1, y=1; x=2, y=3; x=3, y=5.

Question 2

Solve for y: 3y + 5 = 2y + 13

Accepted Answer

y = 8

Answer

Subtracting 2y and 5 from both sides: y = 8.

Question 3

A car travels at a constant speed of 60 mph. Which expression gives the distance (d) traveled in t hours?

Accepted Answer

d = 60t

Answer

Distance equals rate times time, so d = 60t.

Question 4

What is the slope of a line that passes through (2, 3) and (6, 11)?

Accepted Answer

2

Answer

Slope = (11 − 3) ÷ (6 − 2) = 8 ÷ 4 = 2.

Question 5

Which of the following is NOT a function?

Accepted Answer

{(1,2),(1,4),(2,6)}

Answer

A relation is not a function when one x-value maps to more than one y-value; x=1 maps to both 2 and 4.

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