Question

Draw the graphof leniar equation x+y=4?

Answer 1

graph{x+y=4 [-22.8, 22.81, -11.4, 11.42]}

Explanation:

`x+y=4`
now to find the points where it intersects put
x=0 in the equation to get y=4 ......hence we got our first point(0,4)
again put y=0 to get x=4...............hence we got our second point(4,0)
join both the lines and extend bothways to get the graph

Answer 2

See below

Explanation:

You can rewrite the equation as `y=-x+4`, i.e. `y=p(x)`, with `p(x)` being a polynomial of degree `1`. Every polynomial of degree `1` represents a line.

To draw a line, you only need to sample two points, and to sample two points you choose two values for `x` and compute the corresponding `y` values. Let's choose `x=0` and `x=1`, we get

`y = -0+4=4`
`y = -1+4 = 3`

So, this line passes through the points `(0,4)` and `(1,3)`.

Draw these two points and connect them, and you have the line.

graph{-x+4}