Question

When you substitute a value for x or y, you are x or y with a value.

Answer 1

When you substitute a value for x or y, you are

✔ temporarily replacing

x or y with a value.

Explanation:

Answer 2

Explanation:

See whenever we have two variables like x and y.

And also we have given two equations in terms of x and y.

Example: ax + by = p and cx + dy = q

In order to get the solution, we need to find the value of x and y using the given two equations.

So here what we can do is:

Consider any one equation and get x or y from that equation.

i.e consider ax + by = p or x =
`(1)/(a)*(p-by)`

Now plug value of x (or y) from the equation you have considered into the another equation.

i.e c(
`(1)/(a)*(p-by)`)+dy = q

Now solve this equation to get y (or x).

and after that we can find the other variable.