Question

The equation $x=7$ can be written in two variables $x,y$ as

• A. $1.x+1.y=7$
• B. $1.x+0.y=7$
• C. $0.x+1.y=7$
• D. $0.x+0.y=7$

Answer 1

The correct option is B $1.x+0.y=7$

In general, it is obvious that if we want to write an equation $ax=0$ in terms of two variables then it may be written as $ax+(0\times y)=0$.

Hence, the equation $x=7$ can be written in two variables $x$ and $y$ as:

$(1\times x)+(0\times y)=7$