So you will need to solve for x and y before evaluating 2x+y....
2x-y=9, y=2x-9 now this will make 4x^2-y^2=171 become:
4x^2-(2x-9)^2=171
4x^2-(4x^2-36x+81)=171
36x-81=171
36x=252
x=7, now we can use 2x-y=9 to solve for y...
2(7)-y=9
14-y=9
-y=-5
y=5
now we know that x=7 and y=5, 2x+y becomes:
2(7)+5
14+5
19
Answer:
Step-by-step explanation
$20 but im not for sure so if im wrong im sorry
Answer:
64+24
Step-by-step explanation:
Answer:
Consecutive sides must be congruent.
All interior angle adds up to 360°
Step-by-step explanation:
Rhombus:
1. Sides: all 4 sides are congruent.
Then consecutive sides must be congruent.
2.Diagonals : Diagonals bisect each other at 90°.
So, second option is wrong.
3. Sum of interior angle is 360°.
The answer is 7 7/8 because 5 1/4 times 1 1/2 is 7 7/8. I hope this answers your question.
