Question

Which set of equations intersect at (2,–1)?

A.
{
y
=
3
+
x
y
=
−
x
+
1

B.
{
y
=
2
x
−
1
y
=
1
−
x

C.
{
y
=
3
x
y
=
2
x
−
1

D.
{
y
=
2
x
−
5
y
=
1
−
x

Answer 1

D

Check: For (2, −1), y = 2x − 5 gives −1 = 4 − 5, and y = 1 − x gives −1 = 1 − 2, so both are true.