Given: 3x + 2y + 7 = 5x +3y +10 Prove: m = -2
(hint:slope)
when solving please give reason for example: subtraction property of equality combine like terms, definition of a linear pair etc.

im having a LOT of trouble so please help!!!

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.)