Algebra help please!
Solve the system below by graphing. Write your answer as an ordered pair:
X - Y = 4
2x + 5y = 15

y=1

x=5

Step-by-step explanation:

use substitution

x=4+y

2(4+y)+5y=15

8+2y+5y=15

7y=7

y=1

x-1=4

x=5

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.