Answer:
y = -24.6 or y = -123/5
Explanation:
First calculate the slope
slope = rise/run = (-26-(-19))/(20-15) = -7/5
(You can also use points (20, -26) & (25, -33), it should get the same answer)
The standard equation of a line is y = mx + b, where m is slope and b is y-intercept.
Plug in the slope we just got, get ==> y = (-7/5)*x + b
Plug in x = 20 & y -26 ==> -26 = -(7*20)/5 + b ==>b = -26 + 28 = 2
so the equation is y = -7/5x + 2
Finally plug in x = 19 => y = -123/5 = -24.6