This is my question pls help

a = 15

Step-by-step explanation:

Substitute b = 12 , a = 9 into the equation

12 =

12 = ← square both sides

144 = a² - 81 ( add 81 to both sides )

225 = a² ( take square root of both sides )

± = a , then

a = ± 15

a > 0 , so a = 15

4th option is correct xy=-10

if this was to u plzz mark me the brainliest

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c