The problem
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Pls help with this y=3x-21
Answer provided by our tutors
The graph "y=3x-21" is in standard form for graphing "y=mx+b", so 'm' is the slope and -21 is the y-intercept. Entering the equation into the 'Solve' portion should give you a choice of which variable to be solved for, hence 'x' could be chosen and end up with "x=(y+21)/3.