Answer is
Graph A = equation a
Graph B = equation c
Graph C = equation b
Graph D = equation d
Step by step
Equation a is a positive slope of 2 with a y intercept of 3. Only A and B have positive slopes (going up from left to right) and only A has the y intercept of +3, so A is your match with equation a
Equation b is a negative slope of 2 (going down left to right) with a y intercept of 3. Graph C is the only other graph with a y intercept of 3, so graph C is a match to equation b.
Equation c is a slope of positive slope of 2 with a y intercept of -3. Graph B is a positive slope with a y intercept of -3, so graph B is a match to equation c.
Equation d is a negative slope of -2 with a negative y intercept of -3. Graph D is a negative slope with a y intercept of -3, so graph D matches with equation d.