Question

If y²-x=7, find the positive value of when x=9.​

Answer 1

Answer:

4

Step-by-step explanation:

when x = 9:

⇒ y² - 9 = 7

⇒ y² = 7 + 9

⇒ y² = 16

⇒ y = √16

⇒ y = ±4

Therefore, the positive value of y = 4

Answer 2

Answer:

y = + 4

Step-by-step explanation:

y² - x = 7 ← substitute x = 9 into the equation

y² - 9 = 7 ( add 9 to both sides )

y² = 16 ( take square root of both sides )

y = ± $\sqrt{16}$ = ± 4

the positive value of y when x = 9 is + 4