Help I’ll give you Brainleiest

6 cm

Step-by-step explanation:

I don't know may I use the trigonometry functions, therefor I'm going to use Pythagorean theorem and property of 30°-60°-90° triangle.

m∠ACB = 120° ⇒ m∠ACD = 60° ⇒ m∠DAC = 30°

DC is opposite to 30° angle ⇒ AC = CB = 8 cm

From ΔADC: AD² = 64 - 16 = 48 ; AD = 4√3 cm

ΔACB is isosceles ⇒ m∠CAB = m∠CBA = 30°

m∠DAH = m∠DAC + m∠CBA = 2(30°) = 60° ⇒ m∠ADH = 30° ⇒ AH = 4√3 ÷ 2 = 2√3 cm

From ΔADH: DH = = √36 = 6 cm

step-by-step explanation:

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.