3x + 6y = 8 solve for x and y

help plz
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.username bayyy
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If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.