3 years ago

Values of an expression

Mathematics

1 answer:

REY [17]3 years ago

6 0

Substitute a number for each variable

Ex.
2x x=5
(2)(5)
=10

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X=5y: 2x+5y=60 A) 10,4 B) 15,4 C) 20,4 D) 25,4

elena-14-01-66 [18.8K]

Answer:

C) 20, 4

Step-by-step explanation:

X = 5y

2x + 5y = 60

substitute in 5y for x: 2(5y) + 5y = 60

10y + 5y = 60

15y = 60

y = 4

x = 5y

x = 5(4) = 20

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In which direction does the parabola open?

ziro4ka [17]

For this question it opens upwards in

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2 years ago

What is the equation of the coordinate A and B if they are (4,7), (6,3) respectively. What is the equation of the straight line.

Nesterboy [21]

Answer: y+2x=15

Step-by-step explanation:

Given

Two points A and B are (4,7) and (6,3) respectively

Using two-point form

$\Rightarrow \dfrac{y-y_1}{x-x_1}=\dfrac{y_2-y_1}{x_2-x_1}$

Putting values

$\Rightarrow \dfrac{y-7}{x-4}=\dfrac{3-7}{6-4}\\\\\Rightarrow \dfrac{y-7}{x-4}=\dfrac{-4}{2}=-2\\\\\Rightarrow y-7=-2x+8\\\\\Rightarrow y+2x=15$

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3 years ago

Lance decides to buy three sweatshirts and a pair of sweatpants. he has $100 in his wallet. if the price of the sweatpants is $

andre [41]

100 = 40 + 3x

Subtract 40 from each side

60 = 3x

Divide each side by 3

20 = x

The highest price of a sweatshirt can be $20

100 = 40 + 3(20)

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2 years ago

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Americans consume about 13,150,000,000 gallons of carbonated drinks each year. Express this number in scientific notation.

ExtremeBDS [4]

It would be 1.315 × 10¹⁰.

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3 years ago