Question

HELP ASAP!
Solve.
{j+k=3j−k=7

Use the substitution method.
The solution is (5, −2).
There are an infinite number of solutions.
The solution is (8, 1).
There is no solution.

Answer 1

j+k = 3
j-k = 7

Adding the equations together:
2j = 10
j = 5

5+k = 3
k = -2