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in this video were going to go over direct inverse and joint variation word problems so the first thing that you need to be able to do is you need to be able to write the equation so were going to focus on that and then well apply that in solving word problems so lets begin if y varies directly with x the equation that you need is y is equal to kx now lets say if r varies directly with s r is equal to ks if z varies directly with l the equation would be z equals kl so you can see a pattern here thats direct variation inverse lets say if y varies inversely with x y is going to be k divided by x if r varies inversely with s r is equal to k over s if z varies inversely with l z is equal to k divided by l now what if y varies jointly with x and z how would you write that equation so its going to be y is equal to k times x and z if its jointly with x and z so if y varies jointly with r and s the equation is y is equal to k times r times s now what if y varies directly with x but in