Answer:
Addition and Division property
Explanation:
Addition property is used in an equation when the same value is added to both sides of the equation to simplify such equation.
Given the equation 2y-40=-18 to simplify the equation further we need to first add 40 to both sides of the equation thereby justifying the addition property as shown;
2y-40 + 40 =-18+40
2y = 40-18
2y = 22
We will also apply the division property here. Division property is used when both sides of an equation is divided by a number without affecting the equality rule.
Dividing the resulting equation by 2:
2y/2 = 22/2
y = 11
Hence the justification for the equation 2y-40=-18 are both adition and division property.