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3 years ago

A boy is twice as old as his sister who is x years old now. In 2 years, the boy will be

Mathematics

1 answer:

Maksim231197 [3]3 years ago

4 0

Answer and Step-by-step explanation:

2x + 2 is the answer.

If the boy is twice as old, and the sister's age is represented by x, then we multiply 2 to x to represent the boy's age.

Then we add 2 when 2 years pass by.

#teamtrees #PAW (Plant And Water)

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Answer:

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3) see below

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Step-by-step explanation:

Question 1

$15-0.5(4x-2)+4x=17$

$\implies 15-2x+1+4x=17$

$\implies 2x+16=17$

$\implies 2x=1$

$\implies x=\dfrac12$

Question 2

$\textsf{rearrange} \ n=m+1 :$

$\implies -m=-n+1$

$\textsf{add equations} \ -m=-n+1 \ \textsf{and} \ m=2n+2:\\$

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$\textsf{substitute} \ \ n=-3 \ \ \textsf{into} \ \ m=n-1:$

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Question 3

subtract the second equation from the first

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substitute found value for y into first equation

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Question 4

$3j=k$

$k=3j+1$

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