Which operations would create an equivalent system of equations with opposite like terms? 3 x minus 3 y = 3. 4 x 5 y = 13. The first equation can be multiplied by 5 and the second equation by 3. The first equation can be multiplied by –4 and the second equation by –3. The first equation can be multiplied by 4 and the second equation by –4. The first equation can be multiplied by 3 and the second equation by 5.