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AleksAgata [21]
4 years ago
11

Need help with number 7,8 and 9?

Mathematics
1 answer:
zhuklara [117]4 years ago
8 0

Q7: y = 2x+3

Q8: y=-2x+5

Q9: m = -\frac{A}{B}

Step-by-step explanation:

Q7: Given equation of line is:

2x-y=1

Converting into slope-intercept form

2x-y-1 = 1-1\\2x-y-1+y = 0+y\\y = 2x-1

Comparing with the standard slope-intercept form

y = mx+b

We get

m = 2

As the new line has same slope as given line

m_1 = 2

Given

b = 3

The equation is given by:

y = m_1x+b

Putting the values of slope and y-intercept

y = 2x+3

Q8: Given equation of line is:

6x+3y = 12

converting in slope-intercept form

3y = -6x+12

Dividing both sides by 3

y = -2x+4

The slope of line is: -2

The new line has same slope so,

m_1 = -2

Slope-intercept form of line is:

y = m_1x+b

Putting the value of slope

y = -2x+b

Putting the point (2,1) in the equation

1 = -2(2) +b\\1 = -4 +b\\b = 4+1\\b = 5

So the equation is:

y=-2x+5

Q9: Given equation is:

Ax+By = C

subtracting Ax from both sides

Ax+By-Ax = C-Ax\\By = -Ax+C

Dividing both sides by B

\frac{By}{B} = \frac{-Ax+C}{B}\\y = -\frac{A}{B}x + \frac{C}{B}

As the equation is in slope-intercept form, the co-efficient of x is the slope of line

So the slope is:

m = -\frac{A}{B}

Hence,

Q7: y = 2x+3

Q8: y=-2x+5

Q9: m = -\frac{A}{B}

Keywords: Equation of line, slope

Learn more about equation of line at:

  • brainly.com/question/9621364
  • brainly.com/question/9539036

#LearnwithBrainly

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Answer:

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Step-by-step explanation:

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J
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T - Shirts = $10
SweatShirts = 15$

24 *15 =360$

105 - 24 = 81

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810 + 360 = 1170$

T shirts = 81
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Step-by-step explanation:

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