Write a linear function from the given values: f(2)=-2, f(1)=1 f(4)=1, f(8)=4

The slope-intercept form:

m - slope

b - y-intercept

The formula of a slope:

We have:

.

Substitute:

Therefore we have .

Substitute the coordinates of the point (1, 1) to the equation:

     add 3 to both sides

We have:

Substitute:

Therefore we have .

Substitute the coordinates of the point (4, 1) to the equation:

     subtract 3 from both sides

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)