Modeling the above problem in matrix form we have,
[3 5;9 7]*[x y]'=[49 77]'
AX=b
X=inv(A)*b
X=[1.7500 8.7500]'
ie x=1.7500 and y=8.7500
S = D/t
120 = D / 0.5
D = 120*0.5
D = 60 km
S = D/t
70 = D / 2.5
D = 70*2.5
D = 175 miles
Answer:
x= -10
Step-by-step explanation:
Subtract 8x from 4x ( -4x )
-4x-34=6
Add 34 to 6 ( 40 )
-4x=40
Divide by -4 ( -10 )
x= -10
Answer:
140/4=35mph
Step-by-step explanation:
