Answer:
88
Step-by-step explanation:
Answer:
x=4,y=3
Step-by-step explanation:
x=19-5y if we transpose equation 2 for x.
Plug that into equation 1
4(19-5y)+3y=25
76-20y+3y=25
76-25=17y
51=17y
y=3
Plug y=3 into equation 2
x+5(3)=19
x=19-15=4
3.6 in= 55 miles
55x3= 165
55/6= 9
165+9= 174
174 miles
If the maximum is at 2, that means f'(2) = 0 (tan Ф =0)