Graphing calculator

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Im looking for an app either Paid or free APP
Wherein i can input equations like
3x + 4y +3 = 0
Where i can input not one but two variables
All i could find is apps which can take only 1 variable :/
Any help please
Science Graduate in need of help

Originally Posted by Qwerty123 \m/

Im looking for an app either Paid or free APP
Wherein i can input equations like
3x + 4y +3 = 0
Where i can input not one but two variables
All i could find is apps which can take only 1 variable :/
Any help please
Science Graduate in need of help

graphing calculator i used in high school only accepted one variable. Couldn't you change the equation so that it was y = 3/4x + 3/4 and graph that? sorry if i didn't help.