Substitution using inequalities
How to solve with substitution
y=2x+4
3x+y=9
3x+(2x+4)=9
3x+(2x+4)=9
5x+4=95x+4=9
5x=55x=5
x=1
Miconceptions
Re-arranging the equation and then substituting it back into itself. This will make everything cancel out.
Incorrect: 2x + 3y = 4 rearranging x−5y=6→ x−5y=6 x = 5y + 6 Puttingitbackintoitself... 5y+6−5y=6 6=6 0=0
How to solve
just replace the x or y in one equation with what x or y equals in the other
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Substitution method