plug in the value of x in the second equation to have one variable in the equation... 2y/3+y=30 5y/3=30 then multiply 3 on both sides... 5y=90 divide by 5 on both sides... y=18 and to solve for x you have to plug in y on either equation... 1st way to solve for x: x+18=30 subtract 18 on both sides... x=12 2nd way to solve for x: x=(18)2/3 you then solve... x=36/3 x=12
