Ax + By = -C solve for x

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.