Question

If x² - 2xy = 84 and x - y = -10, what is the value of | y | ?​

Answer 1

hey mate

here is the answer...

Answer:

given:

x-y=-10

squaring both sides,

(x-y)=(-10)²

x²+y²-2xy=100

[from x²-2xy=84]

y²+84=100

y²=16

y=±4

thus

|y|=4 (Answer)