X=2+√42 , hope that is helpful .
I hope this helps you
18×2,5=18×25/10=9×5=45
45-18=27
Lines that are pendicular has slopes that multiply to -1
if m1=-5/2, then m2 times m1=-1
-5/2 times ?=-1
times both sides by -2/5
?=2/5
m2=2/5
the slope of line 2 is 2/5
