Use the substitution method to solve the system of equations. y=-8x and 4x-y=3

What can be used to explain a statement in a geometric proof

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y