Answer:
x = -14
Step-by-step explanation:
y = 3x
x = 2y +70
(replace)
x = 2(3x) + 70
(simplify)
x = 6x + 70
-5x = 70
69,168
1 mile = 5280 ft
13 miles · 5280 ft = 68,640 ft
1 yd = 3 ft
176 yds · 3 ft = 528 ft
68640 ft + 528 ft = 69,168 ft