30 POINTS ON TEST PLEASE HELP IF YOU CAN!thanks:)

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined