What expression con you substitute in the indicated equation to solve the system below?

5x+y=8
x+4y=2
a. 2-4y for x in 5x +y=8
b. 8+5x for y in 5x+y=8
c.2+4y for x in x +4y=2
d. 5+8x for y in x+4y=2

1. the following set of data represents the number of waiting times in minutes from a random sample of 30 customers waiting for service at a department store. 4 5 7 10 11 11 12 12 13 15 15 17 17 17 17 17 18 20 20 21 22 22 23 24 25 27 27 31 31 32 a. determine the number of classes and class interval.

Can someone me with this problem i don't understand i need

Is the figure congruent? yes or no?