Ruby wrote the standard form of a linear equation as 4x – 4 x minus StartFraction 2 Over 3 EndFraction y equals 8.y = 7. Jennifer told her that the equation was not yet in standard form and gave her the right advice for how to fix it. What advice did Jennifer give to Ruby? a Multiply both sides of the equation by 3. The standard form of the equation is 12x – 2y = 21. b Multiply both sides of the equation by 3 and then divide both sides by 2. The standard form of the equation is 6x – y = 10.5. c Multiply both sides of the equation by 3. The standard form of the equation is 12x – 2y = 7. d Jennifer told Ruby her equation is already in standard form and there is nothing to correct.