Substituting values from the domain will give the corresponding values from the range.
Table:
x
y
-2
3
-1
3
0
3
1
3
2
3
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=3 ⇔ 0x+ 1y= 3
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=3
Simplify
-2
0( -2)+y=3
y= 3
-1
0( -1)+y=3
y= 3
0
0( 0)+y=3
y= 3
1
0( 1)+y=3
y= 3
2
0( 2)+y=3
y= 3
Using these x and y values as ( x, y) coordinate pairs, we can plot the points. Connecting these points will give us the graph of the equation.
