Step-by-step explanation:
y = ax + b => ax +b = y
-5= a.1+ b => a + b = -5
-9= a.2+b => 2a+b = -9
________-
-a = 4
=> a = -4
a+b=-5 => b = -5 -a
b = -5+4 = -1
so, the Equation : y = -4x -1
