Answer:
y = 4x + 4
Step-by-step explanation:
1. the slope-intercept form is y = mx + b (m is slope, and b is y-intercept)
2. the chart shows that as x rises by 5, y rises by 20. Therefore, as x rises by 1, y rises by 4. So the slope is <em>4</em> (y/x).
2. the y-intercept is when x = 0. Because we know that when x rises by 1, y increases by 4, we can count from the first point we are given.
(-2, -4) + (1, 4) = (-1, 0)
(-1, 0) + (1, 4) = (0, 4)
So, when x is 0, y is 4, so the y-intercept is <em>4</em>.
Plugging those numbers in the equation gives us y = <em>4</em>x + <em>4</em>.
