Hiro rolls a fair pair of six-sided dice. The sample space of all possible outcomes is shown below. Let A be the event that the first die is one and B be the event that the sum of the dice is eight.

What is P(A or B), the probability that the first die is one or the sum of the dice is eight?

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?