help me with this please!! I'll give a medal!!

Question

redsky · Answer

Terry has completed 15 homework problems, and Susan has completed 9. Terry is completing 10 problems per hour, and Susan is completing 12 per hour. After how many hours will Terry and Susan have completed the same number of problems? (1 point)

redsky · Answer

3 hours 
4 hours
5 hours
10 hours

anonymous · Answer

hmm  you know susan's line is S=12x and that terry's is T=10x

anonymous · Answer

susan's line is S=12x+9 actually

anonymous · Answer

plug hours in

anonymous · Answer

I always use brute strength to solve these problems

anonymous · Answer

about 5 hours

anonymous · Answer

You don't need to use brute strength, just find the lines like Ednac suggested and set them equal to each other to see where they intersect.

anonymous · Answer

then solve for x

anonymous · Answer

@msasu25  i just like using brute strength but that works too

anonymous · Answer

ah ok