Question

Solve, using the substitution method.

d + e = 2
d – e = 4

A.
The solution is (3, –1).

B.
There is no solution.

C.
The solution is (5, 1).

D.
There are an infinite number of solutions.

I think its A..

Answer 1

Try plugging in the values--

A. works
B. can't be the answer because "A" works
C. doesn't work
D. There aren't an infinite number of solutions--in general there are only an infinite number of solutions if there are more variables than given equations (i.e. d+e+f = 2, d-e-f=-2), or if one of the functions you have is a multiple of another--i.e something like "d + e = 2, 2d + 2e = 4."

Answer 2

So A is right..?

Answer 3

Yeah, A is correct... meant to mention that lol

Answer 4

okay XD Thank you :)