( X + 3 ) / 4 - ( y + 2 ) / 2 = 0
X + 3 - 2( y + 2 ) = 0
X + 3 - 2y - 4 = 0
X = 2y + 1
3x + y = 1
3( 2y + 1 ) + y = 1
6y + 3 + y = 1
7y = - 2
y = - 2/7
X = 2•( - 2/7 ) + 1 = - 4/7 + 7/7 = 3/7
Ответ ( 3/7 ; - 2/7 )
Sin30= 1/2 cos30= √3/2 tg30= 1/√3 sin60= √3/2 cos60= 1/2 tg60= √3