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Elenna [48]
3 years ago
9

X + y = 12 and y = x - 1. Find the value of 2x + 2y.

Mathematics
2 answers:
Mademuasel [1]3 years ago
5 0
Answer: 2x + 2y = 24

Explanation:

x + y = 12

2(x + y = 12)
2x + 2y = 24

So therefore, 2x + 2y = 24
Leni [432]3 years ago
3 0

Answer:

2x + 2y = 24

Step-by-step explanation:

You have to isolate <em>y</em> and then use substitution.

x + y = 12       and         y = x - 1        

-x       -x          

y = -x + 12       and         y = x - 1

-x + 12 = x - 1

+x          +x

--------------------

12 = 2x - 1

+1          +1

----------------

13 = 2x

2x = 13              [ divide both sides by 2]

x = 6.5

Now, you have to plug <em>x</em> (6.5) into <em>y = x - 1</em>.

y = x - 1

y = 6.5 - 1

y = 5.5

Finally, plug both <em>x</em> (6.5) and <em>y</em> (5.5) into <em>2x + 2y</em>.

2x + 2y

= 2 (6.5) + 2 (5.5)

= 13 + 11

= 24

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Step-by-step explanation:

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We know the room is 18' long on the left side and 12' long on the right side. We subtract 12 from 18 to get 6, and we know that the cut out region is 6' long. We do the same thing with the width, 25' wide at the bottom minus 10' wide at the top and we see that the cut out is 15' wide.

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3 years ago
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Nadusha1986 [10]
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8 0
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Step-by-step explanation:

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Step-by-step explanation:

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X+y+5=0

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If a solution exists y=y so we can say

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So the two solutions are:

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6 0
3 years ago
Read 2 more answers
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