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see explanation

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

To calculate m use the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (2,2) and (x₂, y₂ ) = (8, 5) ← 2 points on the line

m = = =

the line crosses the y-axis at (0, 1) ⇒ c = 1

y = x + 1 ← equation in slope- intercept form

4x+5x+6x=180 sum of all angles of triangle is 180

15x=180

x=180/15

x=12

4x=48

5x=60

6x=72