Solve the system of linier equations by a) substitution, b) elimination

let's start with substitution. we will solve for one variable using one equation and then substitute j to the other equation. for example let's take the first equation and solve for y

now put this I to second formula

now put this back into first equation

so we get x is 2 and y is 0

now we will save using elimination. to do this we wi multiply one equation so that we can add both equations and cancel out a variable
we will multiply the first equation. by 6

now we will add the two equations

you can do the same thing and cancel out x to find y.