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Zarrin [17]
3 years ago
11

How to solve using Substitution or Elimination??? Help!!! y=3x-1 y=2x+2

Mathematics
2 answers:
disa [49]3 years ago
7 0
The answer is x=3 and y=8, here’s the work—


Y=3x-1
Y=2x+2
2x+2=3x-1
2=x-1
X=3

3(3)-1=y
9-1=y
8=y
Iteru [2.4K]3 years ago
3 0

Answer:

x=3

y=8

Step-by-step explanation:

the given equations are y=3x-1 --------(1)

and y=2x+2---------(2)

Using substitution method,

and solving y=3x-1

y+1=3x

or y+1/3 =x ------(3)

Putting the value of x= y + 1 / 3 in equation 2

y= 2x+2

or, y = 2 ( y + 1/3) +2

or, y= 2y + 2 / 3 <u>+</u><u>2</u>

<u>or</u><u>,</u><u> </u><u>y</u><u> </u><u>=</u><u> </u><u>2y</u><u> </u><u>+</u><u> </u><u>2</u><u> </u><u>+</u><u> </u><u>6</u><u> </u><u>/</u><u>/</u><u> </u><u>3</u><u> </u><u>(</u> Taking LCM)

Or, 3 y = 2y + 2 + 6 ( <u>the</u><u> </u><u>denominator</u><u> </u><u>gets</u><u> </u><u>multiplied</u><u> </u><u>to</u><u> </u><u>y</u><u>)</u>

OR, 3 Y - 2Y =6 PLUS 2

or y = 8

therefore, y=8

now substituting the value of y=8 in equation (3)

y + 1 /3 = x

or ,,, 8 plus 1 by 3 =x

or,,,,, 9 by 3 =x

Therefore, x is 3

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Sloan [31]

Answer:

a.  -0.01 < x - 8 < 0.01

b.  7.99 < x < 8.01

c.  see attachment

d. Bolt has to be greater than 7.99 mm and less than 8.01 mm to be within the margin of error of 0.01 mm.

Step-by-step explanation:

-0.01 < x - 8 < 0.01

-0.01 < x - 8   and   x - 8 < 0.01

7.99 < x                     x < 8.01

Write this as:   7.99 < x < 8.01

On graph the 7.99 and 8.01 are very near to each other and represented via open red circle.

8 0
3 years ago
Read 2 more answers
X - 3y = 4<br> 2x - 5y = 8 <br> solve by substitution
Shkiper50 [21]

Answer:

y = 0

x = 4

Explanation:

  • x - 3y = 4
  • 2x - 5y = 8

<u>make x the subject,</u>

x - 3y = 4

x = 4 + 3y __ equation 1

2x - 5y = 8

x = (8+5y)/2 __ equation 2

<u>using substitution method:</u>

(8+5y)/2 = 4 + 3y

8 + 5y = 8 + 6y

6y - 5y = 8 - 8

y = 0

Find x,

x = 4 + 3y

x = 4 + 3(0)

x = 4

7 0
3 years ago
Read 2 more answers
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