Answer:
<h2>
YOUR CORRECT ANSWER'S (D.)</h2>
Step-by-step explanation:
Answer:
x11
Step-by-step explanation:
All I did was add the like terms.
Answer:
A
Step-by-step explanation:
Answer:
<em>x+y=4</em>
Step-by-step explanation:
hello :
note : by identity you have x²-y² = (x-y)(x+y)
in this exercice : 2x²-2y² = 2(x²-y²) = 2 (x-y)(x+y)
means : 2 (x-y)(x+y) = 40
but x-y = 5
so : 2(5)(x+y) =40
x+y=40/10
<em>x+y=4</em>
Im not rlly sure about this it seems confusing