Respuesta :

leeyah188
This is translation. We should start off by representing Pamela as the variable P and Jiri as the variable J.

J=P+13
J+P=53

What I just listed above is a system of equations.

I'm going to plug in the equation for J in J+P=53. As so:

(P+13)+P=53

After plugging in, add like terms.

2p+13=53

Now solve the two step equation.

2p+13=53
-13 -13
-----------------
2p=40
---- ----
2 2

p=20

We just found out that Pamela is 20, but what about Jiri?!

Just simply plug in Pamela's age in one of the system of equations.

J+20=53
-20 -20
---------------
J=33

We found our answer. Jiri is 33 years old!

Have a good day!
irspow
You are first told that Pamela is 13 years older than Jiri so:

p=j+13

Then you are told that the sum of their ages is 53 so:

p+j=53

We already know from the first statement that p=j+13, this makes p+j=53 become:

(j+13)+j=53  so we combine the two j's on the left side

2j+13=53  subtract 13 from both sides

2j=40  divide both sides by 2

j=20

So Jiri is 20 years old.

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