Question

Solve.

{d+e=2d−e=4

Use the substitution method.

There are an infinite number of solutions.

The solution is (5, 1).

There is no solution.

The solution is (3, −1).

Answer 1

\(d+e=2 \qquad \square\)

\(d - e = 4 \qquad \triangle\)

from \(\triangle\): \(d = e + 4\)

Pop that into \(\square\): \(e + 4 +e=2\)

And solve it for e, then solve for d