Explanation:
the slope-intercept form
y = ax + b
"a" is the slope, "b" is the y-intercept (the y-value, when x = 0).
the slope is as always the ratio (y coordinate change / x coordinate change) when going from one point on the line to another.
the given 2 points provide both :
x changes by +10 (from 0 to 10).
y changes by +201 (from 359 to 560).
the slope is
+201/+10 = 20.1
b is provided directly by point (0, 359) :
b = 359
so the equation is
y = 20.1x + 359