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We have a system of equations in two variables, namely, a and c. Use the substitution to find a and c.
Answer:
27°C
Step-by-step explanation:
The temperature on February 9th 1934 = -15°C
The next day the temperature rose 42 degrees.
We need to find an expression for the temperature on February 10th.
February 10th temperature = -15 + 42
= 27°C
So, the temperature on February 10th is 27°C.
Answer:
D
Step-by-step explanation:
=
= 
and
=
=
= 
Hence expression D is equivalent