0.3X - 0.2Y = 4 0.5Y = -75/17 ------------------- Multiply the 2nd equation by 2 (to get the value of Y): Y = -150/17 (or -8 and 14/17) Now go back to the 1st equation and install the value for Y to get the value of X: 0.3X - 0.2Y = 4 0.3X - 0.2*(-150/17) =4 0.3X + 30/17 =4 Multiply both ...