Question

Last week at the lake it was 23 °C. Yesterday it was 13 degrees warmer. What was the temperature yesterday?

Answer 1

Answer

36 C

Solution

23+13
= 36

Answer 2

The temperature yesterday was 36 °C.

Explanation:

I am going to solve this question building a system of equations.

We have that:

x is the temperature last week at the lake.

y is the temperature yesterday at the lake.

Last week at the lake it was 23 °C.

This means that
`x = 23`

Yesterday it was 13 degrees warmer.

This means that

`y = x + 13`

Since
`x = 23`

`y = 23 + 13 = 36`

The temperature yesterday was 36 °C.