How Do I Find The Domain & Range Of

y=2x-4?

graph is linear:

y=2x-4

solve for x=o

y=2x0-4 Eliminate 0

y=-4 solved for y

solve for y=0

0=2x-4 add 4

+4 + 4

4=2x divide by 2

/2 / 2

4/2 = x

2=x solved for x

calculate the slope

Solve for x=1

y=2x1-4

y=2-4

y=2 solved for y

Calculating the slope

y - y

a = x=1 x=0 = 2

1

The graph is

(0, - 4) (2, 0)

The domain is how far left and right it goes on a graph, and the range is how far up and down it goes on a graph. Because this equation is linear (if you graphed it, it would be in a straight line), both the domain and range are infinity, because it keeps going up and to the right, the larger X gets, and smaller and to the left, the more negative X gets.