Solve, using the substitution method.

d + e = 2
d – e = 4

A.
The solution is (3, –1).

B.
The solution is (5, 1).

C.
There is no solution.

D.
There are an infinite number of solutions.

Question

Solve, using the substitution method.
 
d + e = 2
d – e = 4
 
 A.
The solution is (3, –1).
 
 B.
The solution is (5, 1).
 
 C.
There is no solution.
 
 D.
There are an infinite number of solutions.

anonymous · Answer

Ok, well, if we start with the first equation we can solve for e:$$e=2-d$$Substitution is where we solve for one variable in one equation, and then substitute that into another equation.

So since we found e=2-d from the first equation, in the second equation replace e with 2-d, and see what you get for d.

Then you can use e=2-d to find out what e is.