Final answer:
To produce a pair of like terms with opposite coefficients, multiply the first equation by 3.
Step-by-step explanation:
To produce a pair of like terms with opposite coefficients, we need to multiply the first equation by a number that will result in the coefficient of y being opposite in sign to that in the second equation. Looking at the coefficients, multiplying the first equation by 3 will give us -3y in the first equation and +2y in the second equation.
Learn more about multiplying equations