1. $a$
2. $a$
4. $a$

1. $b$
2. $b$
4. $b$

1. $x_1$
2. $x_1$
4. $x_1$

5. $$\color{blue}{\rightarrow}\color{black}\;x_1 \;= \;\frac{-b}{a}$$

   $$\color{blue}{\rightarrow}\color{black}\;x_1 \;= \;-\frac{y_1}{a}$$

1. $y_1$
2. $y_1$
4. $y_1$

5. $$\color{blue}{\rightarrow}\color{black}\;y_1 \;= \;b$$

   $$\color{blue}{\rightarrow}\color{black}\;y_1 \;= \;-a\cdot x_1$$

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If the equation is of the form A x + B y + C = 0 calculate first a=-A/B; b=-C/B

Numbers in the form 1/2 or 0.5 or 1.5E3 are accepted: