Question

write the equation of this line in slope-intercept form.

Explanation:

Step1: Recall slope - intercept form

The slope - intercept form of a line is $y = mx + b$, where $m$ is the slope and $b$ is the y - intercept.

Step2: Find the y - intercept ($b$)

The line crosses the y - axis at $(0,4)$, so $b = 4$.

Step3: Calculate the slope ($m$)

We can use two points on the line. Let's use $(0,4)$ and $(4,0)$. The formula for slope is $m=\frac{y_2 - y_1}{x_2 - x_1}$.
Substitute $x_1 = 0,y_1 = 4,x_2 = 4,y_2 = 0$ into the formula: $m=\frac{0 - 4}{4 - 0}=\frac{-4}{4}=- 1$.

Step4: Write the equation

Substitute $m=-1$ and $b = 4$ into the slope - intercept form $y=mx + b$. We get $y=-x + 4$.

Answer:

$y=-x + 4$