xkatex13
xkatex13
16-09-2017
Mathematics
contestada
If x-y=10 and x squared-y squared =40 then y=?
Respuesta :
kphung76127
kphung76127
16-09-2017
Solve for y in the first equation
-y=-x+10
y=x-10
Now substitute y in the second equation
x^2-(x-10)^2=40
x^2-(x^2-20x+100)=40
20x-100=40
20x=140
x=7
Plug the value of 7 in to any of the equations
7-y=10
y=(-3)
Final answer: y= -3
Answer Link
cornenlla
cornenlla
16-09-2017
12 I know I gave you the wrong answer
Answer Link
VER TODAS LAS RESPUESTAS ( 16+ )
Otras preguntas
Graph with a line going through points zero comma two point five and four comma two point five. Select the equation of the line that passes through the point (3
What important role do third parties often play in US national elections?
Why is a thin ozone layer over Antarctica of particular concern to scientists?
If the side of a square is x + 5, and the square’s area is 225, what is x?
What effect if any did plessy v. fergurson have on the south's jim crow laws?
How many states must approve an amendment before it can be added to the Constitution?
What was the result of administrative weaknesses under the Articles of Confederation?
118/13 = 59/z what is z
In a monarchy, to what degree does the king or queen hold absolute power?
Why do we know more about Hammurabi's code than other early forms of law?
