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morpeh [17]
3 years ago
8

Solve 5x-y=5 and 2y-x^2=11 without using trial improvement

Mathematics
1 answer:
iren2701 [21]3 years ago
8 0

Answer:

x = 7, y = 30  and  x = 3, y = 10

Step-by-step explanation:

5x - y = 5, then y = 5x - 5

2y - x^2 = 11

2(5x - 5) - x^2 = 11

10x - 10 - x^2 = 11

-x^2 + 10x -10 = 11

-x^2 + 10x -21 = 0

x^2 - 10x + 21 = 0

(x - 7)(x - 3) = 0

x = 7, y = 30

x = 3, y = 10

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Step-by-step explanation:

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3 years ago
scientist needs 120 liters of a 20% acid solution for an experiment. The lab has available a 25% and a 10% solution. How many li
sattari [20]

Answer:

The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.

Step-by-step explanation:

If x is the liters of 25% solution, and y is the liters of 10% solution, then:

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Solve the system of equations using substitution or elimination.  Using substitution:

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3 years ago
Instructions: Find the missing side. Round your answer to the nearest
allochka39001 [22]

Answer:

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5 0
3 years ago
What is “8 - 4(-x + 5)” equivalent too?
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8 - 4(-x + 5)

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