Answer:
x = 5, y = -1/2
Step-by-step explanation:
3.5x - 5y = 20
3x + 4y = 13 multiply by 1.25 so the y's match up (you could match x's too)
3.75x + 5y = 16.25
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3.5x - 5y = 20
3.75x +5y = 16.25
7.25x + 0y = 36.25 you can add or subtract here (on this equation you add)
7.25x=36.25
x=5 So now we have x=5 and to find y we can just plug in x into one of the equations
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3(5) + 4y = 13
15 + 4y = 13
4y = -2
y = -1/2
x = 5, y = -1/2
Then you can plug in both to check your answers.
7 / 12 = 0.583333333
Divide them all to see which one equals 0.583333333.
A.
8 / 13 = 0.615384615
B.
10 / 15 = 0.666666667
C.
14 / 19 = 0.736842105
D.
21 / 36 = 0.583333333
Therefore, your answer is D.
The car could travel 9,000 ft in 3 hrs .
it would take the car 600 hrs to travel 36,000 ft .
Answer:
36.20
Step-by-step explanation:
add 2.75 and 4.5 which gets you to 7.25 and subtract your 7..25 from 43.50
(Not sure if this is what you were looking for)
