Solve the system of equation by adding or subtracting. x+4y=4 3x-4y=-4
2 answers:
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Answer:
x=-8
Step-by-step explanation:
on squaring both sides
either x-2=0 or x+8=0
either x=2 or x=-8
Putting x=2 in original equation, we get
7=7 hence, it is not an extraneous solution
Putting x=-8 in original equation
i.e. 3=-3
Hence, x=-8 is an extraneous solution (since it doesn't satisfy the original equation)
Answer:
56.7 mi/h
Step-by-step explanation:
The formula for average speed is:
Average Speed =
Thus we have:
Average Speed = mph
<em>Rounding to the nearest tenth, we have </em>
Average Speed = 56.7 mi/h