A number is equal to 3 times a smaller number. Also, the sum of the smaller number and 4 is the larger number. The situation
is graphed on the coordinate plane below, where x represents the smaller number and y represents the larger number.
10 y
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+
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1
2
3
4
5
6
7
8
9
*
Which two equations represent the situation?
O y-jx and y=x-4
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1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

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