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zhannawk [14.2K]
3 years ago
11

4x +5 Write a simplified equivalent expression for the sum of their ages.

Mathematics
2 answers:
beks73 [17]3 years ago
6 0

Step-by-step explanation:

y=4x+5+x

y=5x+5

frozen [14]3 years ago
5 0

Answer:

9x-5   (only when x=2) (age is double of  4)

Step-by-step explanation:

4x+5

4*2 +5 = 13

4x +5x-5 =13

9x-5=13

9*2-5=13

18-5=13

 WITH OTHER NUMBERS (x=2)

3x+5

3*2 +5 =11

3*2 +5*2 -5 =11

8*2-5=11    (8x-5)=11

16-5=11

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Nezavi [6.7K]
Hi there! Marcie made a mistake in the last step of the solving process.

Let's solve this problem step by step!
−2(x − 5) − 12 ≤ 4 + 6(x + 3)

First work out the parenthesis, which can for instance be done using rainbow method.

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The parenthesis are worked out correctly. Remember that multiplying a negative by a negative gives you a positive.

Now we can collect the terms.
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Next up is subtracting 6x from both sides and adding 2 to both sides of the inequality.
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This step is also correct.
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Mistake! Marcie forgot to flip the sign. Instead the answer should be x \geqslant - 3

~ Hope this helps you!
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