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Mandarinka [93]
3 years ago
13

Explain what their first step would be if they wanted to eliminate the y variable from the equations.

Mathematics
1 answer:
Vinvika [58]3 years ago
5 0

Answer:

  • r1 +4×r3 ⇒ r1
  • r2 -3×r3 ⇒ r2

Step-by-step explanation:

We note that the coefficient of y in equation (iii) is 1, so it is convenient to use that equation to eliminate y from the others.

__

<em>To eliminate the y-variable from equation (i), four times equation (iii) can be added to equation (i).</em>

<em>To eliminate the y-variable from equation (ii), three times equation (iii) can be subtracted from equation (i).</em>

_____

The result of these operations would be ...

  10x +6z = 28\quad\text{(iv)}\\\\-7x-9z=2\quad\text{(v)}

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Oduvanchick [21]

It is given that

a+b=20  -------------------- (1)

b+c=30 -----------------------(2)

We have to calculate

3 a + 4 b +7 c

Now multiplying equation(1 )by 3,we get

3 a+ 3 b=60  ----------------------------------(3)

and Multiplying equation( 2) by 4,we get

4 b + 4 c=120  -----------------------------------(4)

Adding expression (3) and (4),we get i.e left hand side of 3 to left hand side of 4 and right hand side of 3 to right hand side of 4.

3 a+ 3 b+ 4 b+ 4 c=60+120

Adding like terms, we get

3 a+ 7 b+ 4 c =180, Which is the required solution.



4 0
3 years ago
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Alenkasestr [34]

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6 0
3 years ago
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John's garden is 12ft long and 15ft wide. How<br> long is John's garden in yards?
kkurt [141]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
Read 2 more answers
Question is attached.
Gemiola [76]
1. c
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