SBAC Grade 8 Math 3

Question 1

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

Accepted Answer

2

Answer

Slope = (11 - 3)/(6 - 2) = 8/4 = 2.

Question 2

Solve for x: 4x - 7 = 2x + 9.

Accepted Answer

8

Answer

Subtract 2x and add 7: 2x = 16, so x = 8.

Question 3

A line has equation y = -3x + 5. What is its y-intercept?

Accepted Answer

5

Answer

In y = mx + b, the y-intercept b is 5.

Question 4

Which equation represents a line with slope 0?

Accepted Answer

y = 4

Answer

A horizontal line y = 4 has slope 0.

Question 5

How many solutions does 3x + 6 = 3x + 6 have?

Accepted Answer

Infinitely many

Answer

Both sides are identical, so every value of x is a solution.

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