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 ( 62+ )
Otras preguntas
Who established a school in Portugal to help sea captains get better at navigation
How many bones does a full grown male have in his body?
what brought the greek people together after centuries of fighting over land and trade?
big dipper. how did this constellation get its name.
In the following addition problem, the letters A,B,C stand for three different digits. What digits should replace each letter? A B C+ A C B_________C B A
What are 3 figurative language's in the poem "on the grasshopper and the cricket"by john keats
Three yrs ago Reagan was three times as old as Sarah and half as old as Lauren. Three yrs from now, Reagan will be twice as old as Sarah. How old are they now?
what is 12/21 reduced to
A relationship that can be used to solve for the Time it takes for a bird to fly between two trees is A.speed*distance B.speed+distance C.speed/distance D.dista
I am a number between 60 and 100. My ones digit is two less than my tens digit. I am a prime number. What number am I. Explain.
