(5, 6)
Step-by-step explanation:
3x + 7y = 57
Substitute y= x+1
3x + 7(x+1) = 57
3x + 7x + 7 = 57
3x + 7x = 57-7
3x + 7x = 50
10x = 50
x = 5
y= x+1= 5+1 = 6
the first one, all those points on the line just make a strait line.