Can someone plz answer these 3 questions

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers