Choose the correct graph of the given system of equations. (2 points)

y − 2x = −1
x + 3y = 4

a
graph of two lines, one with a positive slope and one with a negative slope, that intersect at the point negative 1, 1

b
graph of two lines that intersect at the point 1, 1

c
graph of two parallel lines with positive slopes

d
None of the above