Which of the following systems of equations is an example of one where substitution is the best method? A.) x = 4
y = 11
B.) y = 2/7x + 11
3x - 4y = -24
C.) 5x + 3y = 15
-3x = 6y = 12
D.) 4x - 5y = 20
-6x + 2y = -42

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)