Solve the system of equations below.
2 answers:
Answer:
Option B is correct
(9, 3)
Step-by-step explanation:
Given the system of equations:
.....[1]
......[2]
Multiply equation [1] by 2 both sides we have;
.....[3]
Subtract [3] from [2] to eliminate x we get;
Combine like terms;
or
y = 3
Substitute in [1] we have;
x-2(3) = 3
x -6 =3
Add 6 to both sides we have;
x = 9
Therefore, the solution for the given system of equations is, (9, 3)
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Answer:
0.5hrs
Step-by-step explanation:
Let the speed downhill be ,
Speed uphill is . We are told than speed uphill is
the speed on flat ground. Therefore the speed on level ground will be
.
From this info, we can obtain the actual speed, on level ground as:
speed, distance and time have the relation so to obtain time to cover 45miles:
Hence it takes 0.5hrs to cover 45miles on flat ground.