Solve the system of equations by the substitution method.

x+2y=-4
3x+5y=-14

a.
the solution set is { ? }
(type an ordered pair.)
b.
there are infinitely many solutions. the solution set is {(x,y) | ? }
(type an equation.)
c.
there is no solution. the solution set is empty set.

Option A

The solution set is (-8,2)

Step-by-step explanation:

Given is a system of equations as

We have to solve this by substitution method

Consider the first equation and write x in terms of y

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Substitute in II equation as follows:

The system has a unique solution and the solution set is

(-8,2)

39 = r - 13

It would be C :)

WHY? 

Because r is our unknown number, and if 13 is subtracted from it, then you know that it looks like : r - 13 :)

Thus, making our answer C) because it is the only one that has 13 being subtracted.

~Hope I helped!~