Answer:
input = 5
Step-by-step explanation:
y = -2x - 6
When y = -16
-16 = -2x - 6
divide by -2 on both sides,
8 = x + 3
x = 8 - 3 = 5
no solution
solve by elemination
BC=5
BC^2= AB^2 + AC^2
x^2= 4^2 + 3^2
x^2= 16 +9
x^2= 25
x=
x= 5
X+20° = 180°
or, X = 180°-20°
or, X = 160°