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[zein]

Can I draw formula of straight ax+by+c=0, without changing it first to Y=.... with my FX 1.0 Plus?

Thanks.

[BiTwhise]

Nope, you'll have to solve for Y first

You can do this in CAS:

//Solve the expression for Y
Solve(expression,Y)
//Assign the right side of the eqation to a graph var (press vars)
getRigth(eqn(N))->Yn //where N is the equation the answer was assigned to, n is any number 1 to 20, and 'Y' is a graph var
GRPH //F5 in CAS mode
Draw //F6