SOLUTION: This problem has been giving me a head ach for 2 days!! Please help! I need to know how to do this step by step, so that I can do the others... Thanks!! Two solutions of the equ

Algebra ->  Graphs -> SOLUTION: This problem has been giving me a head ach for 2 days!! Please help! I need to know how to do this step by step, so that I can do the others... Thanks!! Two solutions of the equ      Log On


   

Question 98817: This problem has been giving me a head ach for 2 days!! Please help! I need to know how to do this step by step, so that I can do the others... Thanks!!
Two solutions of the equation Ax+By=1 are (3,-1) and (-4,-2)
Find A and B... After finding A and B what is the slope and the y-intercept of the line?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
plugging in the points gives 3A-B=1 and -4A-2B=1

multiplying the first equation by -2 gives -6A+2B=-2 ... adding this to the second equation gives -10A=-1 ... A=.1

3(.1)-B=1 ... .3-1=B ... -.7=B

.1x-.7y=1 ... -.7y=-.1x+1 ... y=(1/7)x-(1/.7) ... y=mx+b ... slope is 1/7 and y-intercept is -10/7