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ioda
3 years ago
11

Use the table to answer the following question.

Mathematics
1 answer:
Bas_tet [7]3 years ago
6 0

Answer:

y = \frac{11}{6}x+\frac{53}{2}

Step-by-step explanation:

Let the equation of the line passing through a point (x', y') and slope 'm' is,

y - y' = m(x - x')

Slope of the line passing through (x_1,y_1) and (x_2,y_2) is represented by,

m = \frac{y_2-y_1}{x_2-x_1}

If two points given in the bale are (-9, 10) and (3, 32),

Slope 'm' = \frac{32-10}{3-(-9)}

               = \frac{22}{12}

               = \frac{11}{6}

Therefore, equation of the line passing through (3, 32) and slope = \frac{11}{6} will be,

y - 32 = \frac{11}{6}(x - 3)

y = \frac{11}{6}x-\frac{11}{2}+32

y = \frac{11}{6}x+\frac{53}{2}

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A school bought pens, each costing $1, and pencils, each costing $0.5. The cost of the whole purchase was $220. How many pens an
Mkey [24]

Answer:

  • <u>120 pens and 200 pencils.</u>

<u></u>

Explanation:

You can set a system of two equations.

<u>1. Variables</u>

<u />

  • x: number of pens
  • y: number of pencils

<u>2. Cost</u>

  • <em>each pen costs</em> $1, then x pens costs: x
  • <em>each pencil costs</em> $0.5, then y pencil costs: 0.5y

  • Then, the total cost is: x + 0.5y

  • The cost of the whole purchase was $ 220, then the first equation is:

          x + 0.5y = 220 ↔ equation (1)

<u>3. </u><em><u>There were 80 more pencils than pens</u></em>

Then:

  pencils  =      80   +   pens

       ↓                               ↓

       y        =      80   +      x        ↔ equation (2)

<u>4. Solve the system</u>

i) Substitute the equation (2) into the equation (1):

  • x + 0.5(80 + x) = 220

ii) Solve

  • x + 40 + 0.5x = 220
  • 1.5x = 180
  • x = 180/1.5
  • x = 120 pens

iii) Substitute x = 120 into the equation (2)

  • y = 80 + 120
  • y = 200 pencils

Solution: 120 pens and 200 pencils ← answer

6 0
3 years ago
The cost of a service call to fix a washing machine can be expressed by the linear function y = 45 x + 35, where y represents th
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Answer:

the slope represents the cost for each hour it takes to repair the machine.Step-by-step Answer:

We are given that  the cost of a service call to fix  a washing machine can be expressed by the linear function

Where

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x=Number of hours takes to fix the machine

We have to find that slope in this function what represents.

General equation of line is given by

Where m=Slope of line

c=y- intercept

Comparing the general equation with the given function

We get m=45,c=35

m=45 represents the cost for each hour it takes to repair the machine because when number of hours multiplied by 45 then we get total cost of x hours.

Hence, the slope represents the cost for each hour it takes to repair the machine.

8 0
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Answer:

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Answer:

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