Help please!.

Question

The system of equations is coincident

 

What are the missing values?

 

 

3X+y=7

9x+ ? y=?

Answer 1

Step 1:

The system of equations is coincident.

Two lines that lie on top of one another are called coincident lines.

The 2nd one has a 9x therefore the ratio of x-terms are 1:3.

3x+y = 7         ...... (1)

Multiply equation (1) by 3.

3(3x+y ) = 3(7)

Using distributive formula: a (b + c ) = ab + ac.

3 (3x) + 3(y ) =21

9x +3y =21

Solution:

Therefore the missing terms are 3 and 21.