Methane, ch4, burns in oxygen gas to form water and carbon dioxide. what is the correct balanced chemical equation for this reaction?

i'm having a hard time understanding how to balance a chemical equation. i'm really not sure how to even begin. !

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.