for i in range(int(input())):
a ,b = map(int,input().split())
print("y = {}x + {}".format(a, b))
for y in range(a*10+b, -1,-1):
for x in range(0, 11):
if x == 0:
print(end = "*")
elif y == 0:
print(end = "*")
elif y == a * x + b:
print(end ="*")
else:
print(end = " ")
print()