# SOLUTION: I cannot understand how to find b in y = mx + b? as follows: Question: Put in y = mx + b form, then graph. x-intercept=4, slope=-3 so I wrote it as follows: y=-3x+b = 0=-3

Algebra ->  Algebra  -> Graphs -> SOLUTION: I cannot understand how to find b in y = mx + b? as follows: Question: Put in y = mx + b form, then graph. x-intercept=4, slope=-3 so I wrote it as follows: y=-3x+b = 0=-3      Log On

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 Click here to see ALL problems on Graphs Question 92060: I cannot understand how to find b in y = mx + b? as follows: Question: Put in y = mx + b form, then graph. x-intercept=4, slope=-3 so I wrote it as follows: y=-3x+b = 0=-3(4)+b and here I have the problem, to find b I dont know i I should multiply 3(4) first, or try 0+3=(4)+b... or 0/4=3+b... I usually come up with b=12, b=-12, b=3/4.... and they say the answer is 4, as in y=-3x+4 Thank you in advance for any aid that you can offer me... yours truly, Michael Answer by funmath(2925)   (Show Source): You can put this solution on YOUR website!Hi Michael, If the x-intercept is 4, you're right, b=12. If the y-intercept is 4, then b=4. Check the problem to make sure you copied it right. There could be a type-o in the book. find b in y = mx + b? as follows: Question: Put in y = mx + b form, then graph. x-intercept=4, slope=-3 y=-3x+b 0=-3(4)+b 0=-12+b 12+0=12-12+b 12=b y=-3x+12 OR if the question was: Put in y=mx+b form, then graph. y-intercept=4, slope=-3 y=-3x+4 If you need help with the graph, let me know. Happy Calculating!!!!