Answer:
A: y = -1/2x+3
Step-by-step explanation:
When it says "line j is perpendicular to line k" that means line j's slope will be an opposite reciprocal of line k's slope. So the opposite reciprocal of 2 is -1/2 (opposite of 2 is -2 and the reciprocal of -2 is just -1/2) and then it gives you the y-intercept, (0,3), which means that A is the correct answer.
