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3 years ago

URGENT 30 POINTS! Solve. {y=x−75x+2y=7 Use the substitution method.

Mathematics

2 answers:

NeTakaya3 years ago

6 0

Y = x - 7 ---------- (1)
5x + 2y = 7 ------ (2)

Sub (1) into (2):
5x + 2(x -7) = 7
5x + 2x - 14 = 7
7x - 14 = 7
7x = 7 + 14
7x = 21
x = 3 ----- -sub into (1)
y = x - 7
y = 3 - 7
y = -4

Ans: x = 3, y = -4

Alecsey [184]3 years ago

4 0

Here is your answer, my good sir, or maiden.

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3 years ago

Mr. Whittaker’s science class uses tide gauges to measure annual variations in water levels at different parts of a river, and t

alex41 [277]

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Complete question

mr. whittaker’s science class uses tide gauges to measure annual variations in water levels at different parts of a river, and then compares those variations to the average annual trend. matea recorded that the water level in one part of the river fell 1.05 millimeters per year for 2.48 years. this data will be compared to the average annual trend, which shows the water level rising 1.8 mm/year.

1) Which number represents the rate at which the water level fell?

a. -1.05 mm/year

b. -1.8 mm/year

c. -2.48 years

d. -2.48 mm/year

2) Which number should the rate be multiplied by to find the total variation in water level?

a. 1.05 mm/year

b. 1.8 mm/year

c. 2.48 years

d. 2.48 mm/year

Answer:

1) Which number represents the rate at which the water level fell?

a. -1.05 mm/year

2) Which number should the rate be multiplied by to find the total variation in water level?

c. 2.48 years

Step-by-step explanation:

Total Variation in the water level is calculated by multiplying the rate at which the water level and number or years at which the rate of the water level fell

From the question, we can see that the rate at which the water level fell is -1.05 mm/year and number of years at which the water level fell is 2.48mm

Hence,Total Variation in the water level is calculated as

-1.05 mm/year × 2.48 years

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nataly862011 [7]

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katovenus [111]

Good evening

Answer:

A) 6

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Firstly, the solution set to the inequality is : x > 7

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The only number that is NOT in the solution set is 6

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