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

ACCESS MORE ACCESS MORE ACCESS MORE ACCESS MORE

Otras preguntas

how do you write 22.056 in expanded form

why did few people rebel against Cyrus rule, this is a question for ancient greece

Which best describes the assertion, which Dickinson makes in "There Is No Frigate Like a Book," that a great book can spark a reader's imagination and transpor

What were the main cause of World War 1

What term refers to placing emphasis on a weak or offbeat?

a family takes 2 1/2 hour to drive from their house to a lake at 48mi/h. the travel time varies inversely with the speed of the car. how long will the return tr

Which of the following was a prominent Federalist? A. Patrick Henry B. Richard Henry Lee C. James Madison D. Samuel Adams

what is 3n+5=6 what is the answer for 3n+5=6

Which sentence uses possessive personal pronouns correctly? A. Have you seen the cat and its kittens? B. Their's is the one on the right, under the box. C. Stan

Potato crops in Idaho have been damaged by plant disease, causing a scarcity of potatoes in the market. What is the most likely effect of the scarcity? A. The p