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Eva8 [605]
2 years ago
8

HELP PLEASE

Mathematics
1 answer:
Lyrx [107]2 years ago
6 0
The solution to the equation is B. x = 9
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Mrs Tan bought 4 times as many pens as notebooks and each notebook cost $8.20 more than each pen. She spent $26 more on the book
lilavasa [31]
Let x be the cost of 1 pen
then cost of 1 notebook = x + 8.20

Let y be the number of pens Tan buys
then number of notebooks Tan buys = y/4

She spent $26 more on books than on pens which means

Cost of notebooks - Cost of pens = 26
(x + 8.20) * y/4 - xy = 26

Sinplifying it

(xy + 8.20y)/4 - xy = 26
(xy + 8.20y - 4xy)/4 = 26
8.20y - 3xy = 104

She spent $394 which means

Cost of notebooks + Cost of pens = 394
(x + 8.20) * y/4 + xy = 394

Simplifying it

(xy + 8.20y)/4 + xy = 394
(xy + 8.20y + 4xy)/4 = 394
8.20y + 5xy = 1576

Now, we have two equations,

(1) 8.20y - 3xy = 104
(2) 8.20y + 5xy = 1576

Now we need to find a third equation with either x or y as the subject of any of both the previous equations.

Let's make y the subject of (2) equation

8.20y + 5xy = 1576
y(8.20 + 5X) = 1576
(3) y = 1576/(8.20 + 5x)

Let's substitute the new value of y from (3) into (1) because we rearranged (2) to from (3)

8.20y - 3xy = 104
y(8.20 - 3x) = 104
y = 104/(8.20 - 3x)
1576/(8.20 + 5x) = 104/(8.20 - 3x)
1576 * (8.20 - 3x) = 104 * (8.20 + 5x)
12923.2 - 4728x = 852.8 + 520x
12923.2 - 852.8 = 4728x + 520x
12070.4 = 5248x
12070.4/5248 = x
x = 2.3

Now find the value of y by substituting the value of x in either equation, preferably (3)

y = 1576/(8.20 + 5x)
y = 1576/(8.20 + 5 * (2.3))
y = 80

Therefore cost of 1 notebook = x + 8.20 = 2.3 + 8.20 = $10.50

8 0
3 years ago
The LaSalle High School senior class raised funds for an end of the year cruise getaway. The city gave them a special package fo
harkovskaia [24]
45 students is the answer to the question

8 0
3 years ago
Read 2 more answers
60 more points i believe
kondor19780726 [428]
<h3>C</h3>

f(x) does have an inverse function since it does pass the horizontal line test

5 0
2 years ago
The graph of f(x) is obtained by reflecting the graph of g(x)=3|x| over the x-axis.
Alinara [238K]

Answer:

Choice B), f(x) = -3|x|.

Step-by-step explanation:

Each point on the graph of g(x) can be represented as (x, g(x)).

When the graph of g(x) is reflected over the x-axis, each point on the graph is also reflected over the x-axis. The x-coordinate of each point will not change but the sign in front of the y-coordinate will flip. For example, 1 (same as +1) will become -1, and vice versa. In general, (x, g(x)) will become (x, -g(x)).

On the other hand, points on the graph of f(x) can be represented as (x, f(x)). f(x) is the reflection of g(x), so (x, -g(x)) and (x, f(x)) shall be equivalent. In other words,

f(x) = -g(x) = - 3|x|.

5 0
2 years ago
For the line above, is the slope positive or negative? *
nadya68 [22]
The slope is positive
(2)
4 0
2 years ago
Read 2 more answers
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