Equasion 1 ax+by=c equasion 2 dx+ey=f
a, b,c, d,e and f are non zero real numbers which of the following could replace equasion 1 and still have the same solution

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)