Janelle is five years younger than Louisa. In three years, Janelle will be half Louisa’s age. If j represents Janelle’s age now and l represents Louisa’s age now, which matrices represent the situation?

Answer: C. I just took the test: [1 , -1][j]= [5]
[1 , -1/2][l]=[-3/2]

Go ahead and verify for "45 points"