Which set of steps shows the solution to the equation 2y = −8?

y = −8 − 2; y = 6
y = −8 ÷ (−2); y = 4
y = −8 ÷ 2; y = −4
y = −8 − (−2); y = −6

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30