x - y + 4 = 0 \quad p ( - 2,1 )
Solve for x
x=y-4
Solve for p
p\in \mathrm{R}
x=y-4
Graph
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x-y+4=0p
Multiply 0 and -2,1 to get 0.
x-y+4=0
Anything times zero gives zero.
x+4=y
Add y to both sides. Anything plus zero gives itself.
x=y-4
Subtract 4 from both sides.
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