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Zanzabum
3 years ago
12

Help please Solving Systems Using Inspection

Mathematics
2 answers:
Kamila [148]3 years ago
6 0
The lines appear to be parallel. We can check this out by examining the
two equations, and we see that sure enough, both lines have the same
slope (1/2) so they're definitely parallel.  Parallel lines never intersect,
so this pair of equations has NO solutions.  NONE.  Zero. Bubkes. Nada.
pashok25 [27]3 years ago
3 0

The Other dude is correct I did the test

The answer is None

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Step-by-step explanation:

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A:4x+4=108<br>B:4x+4=90<br>C:108+4×+4=180<br>D:180=90+4×+4<br>E:×+108=108​
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2 years ago
The ratio of Wei Ling's age to Wei Xuan's age 5 years ago was 2: 5. In 9 years
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Answer:

15 years old

Step-by-step explanation:

Start by defining the variables that we are going to use throughout our working:

Let the current age of Wei Ling and Wei Xuan be L and X years old respectively.

Next, form equations using the given information.

<u>5 years </u><u>ago</u>

Wei Ling: (L -5) years old

Wei Xuan: (X -5) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan's is 2: 5,

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Cross multiply:

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Expand:

2X -10= 5L -25

2X= 5L -25 +10

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<u>9 years time</u>

Wei Ling: (L +9) years old

Wei Xuan: (X +9) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan is 3: 4,

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Cross multiply:

3(X +9)= 4(L +9)

Expand:

3X +27= 4L +36

3X= 4L +36 -27

3X= 4L +9 -----(2)

Let's solve using the elimination method.

(1) ×3:

6X= 15L -45 -----(3)

(2) ×2:

6X= 8L +18 -----(4)

(3) -(4):

6X -6X= 15L -45 -(8L +18)

0= 15L -45 -8L -18

0= 7L -63

7L= 63

L= 63 ÷7

L= 9

Substitute L= 9 into (1):

2X= 5(9) -15

2X= 45 -15

2X= 30

X= 30 ÷2

X= 15

Thus, Wei Xuan is 15 years old now.

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