TS EAMCET 11-Sep-2020 Shift 2 Solved Paper

Given that, line
‌

x−4

1

=‌

y−2

1

=‌

z−7

2

Line is passing through point P(4,+2,7) and direction ratios (1,1,2)
and lies on the given plane ax+by+z=7
So, point will satisfy the equation of plane a(4)+b(+2)+(7)=7
4a+2b=0 .....(i)
Now direction ratios of the line and direction ratios of the plane will be perpendicular so their product must be zero
0=a+b+2
or ‌‌a+b=−2