Question

Write an equation to describe this function. ​

Answer 1

• f(x) = 0.8x - 3

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Given is a linear function.

Take two points belonging to the line and find its equation.

Points are (0, -3) and (5, 1).

Find the slope:

• m = (1 - (-3))/(5 - 0)
• m = 4/5 = 0.8

We know the y-intercept from the first point, b = - 3.

The line, using slope-intercept form, y = mx + b, is:

• f(x) = 0.8x - 3