Build the augmented matrix for the following word problem: Billy has $144000 invested in three properties. One earns 12%, one 10%, and one 8%. His annual income from the properties is $14,000 and the amount he invested at 8% is twice that invested at 12%. You can replace each value in the matrix of the template with the number that should go there. Let x be the 12% property, y be the 10% property, and z be the 8% property. You are building 3 different equations for this