Step by step Your original was 2y = 4x -9 You want the variables on the left side of the = sign Subtract 4x from both sides -4x + 2y = -4x + 4x -9 Combine like terms -4x + 2y = -9 Problem solved
Caroline traveled 544 miles on 16 gallons. We do some simple math and divide 544/16 and receive 34 miles/gallon. All we do now is multiply 34 * 9 and we receive 306 gallons.
