Question

Please solve 7 and 8

Answer 1

y = -x

x + y = 0

slope of liñe = -1
but we know, slope = tan∅
where ∅ is angle between line and x-axis in positive direction .

so, tan∅ = -1
tan∅ = tan3π/4

∅ = 3π/4

8) perpendicular distance between ( P, r)
from line ax + by + c = 0 is
| ap+ rb + c | /√(a² +b²)

now use this concept ,

3√17 = | a|/√(3² +5²)

3√17× √34 = | a |

| a | = 51√2

a = ± 51√2

Answer 2

see attachment...

hope
it
will
help
you.

(^_^)