Question

The equation y = 2x + 1 is changed to y = 2x - 1. How does this change the graph of the line?

A) The original line will shift down 1 unit.
B) The original line will shift left 1 unit.
C) The original line will shift left 2 units.
D) The original line will shift down 2 units.

Answer 1

D) The original line will shift down 2 units.

Explanation:

The rate of changes [slopes] remain the same [2], so all you need to do is figure out how much far
`\displaystyle [0, 1]`is from
`\displaystyle [0, -1],` and that would be two units:

`\displaystyle -1 + 2 = 1`

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