Answer:X=11
Step-by-step explanation:
Angles on a straight line sum up 180°
=>Let take line t (the diagonal) as our straight line
Therefore ; (7x – 1)° + (9x + 5)° = 180°
=>(7x + 9x + 5 – 1) = 180
=> 16x + 4 = 180
=> 16x = 180 – 4
=> 16x = 176
=> (16x)/16 = (176/16)
=> x = 11
HOPE MY EXPLANATION HELPED YOU
