Substituting values from the domain will give the corresponding values from the range.
Table:
x
y
0
-1
2
-1
4
-1
Graph:
Practice makes perfect
The first thing to notice about this equation is that it is missing a variable term. Let's try to rewrite it in standard form, Ax+ By= C, using 0 as the coefficient for our missing variable.
y=-1 ⇔ 0x+ 1y= -1
Let's graph using a table. First select some arbitrary values from the domain, then substitute them for x in the given equation. Solving for y will give us the corresponding values from the range.
x
0x+y=-1
Simplify
0
0( 0)+y=-1
y= -1
2
0( 2)+y=-1
y= -1
4
0( 4)+y=-1
y= -1
Using these x and y values as ( x, y) coordinate pairs, we can plot the points. Connecting these points with a line will give us the graph of the equation.
