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.

D)The original line will shift down 2 units.

Step-by-step explanation:

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

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x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18