Assuming you're asking what an algebraic expression would look like...
Answer:
To decide whether to add or subtract, determine if the values of the coefficients are the same or opposites:
. If the values are the same, subtract the equations.
• If the values are opposites or additive inverses, add the equations.
Step-by-step explanation:
Given
Required
How to solve
Options (1) and (2) are incorrect because none of the options eliminate x or y.
For option (3),
- Check for the coefficients of x and y
- If they are the same (sign and value), then subtract; otherwise add
For instance:
Rewrite the second equation
The coefficient of y are the same, so we subtract;
<em>See that y has been eliminated</em>
The error lies in step 2
You subtract 20. To 60, not add
1. Diagonals of kite bisect each other but kite is not parallelogram.
2. Square - the diagonals bisect each other
3. Rhombus - the diagonals bisect each others.
Not all parallelogram have their diagonals bisecting each other.