Răspuns:
Explicație pas cu pas:
ecuatia dreptei
y = ax + b
___________
A(-5, 3); B(1, -5)
y = ax + b
3 = -5a + b
-5 = a + b
b = 3 + 5a
-5 = a + 3 + 5a
6a = -5 - 3 = -8
a = -8/6 = -4/3
b = -5 - a = -5 + 4/3 = -15/3 + 4/3 = -11/3
ecuatia dreptei y = -4x/3 - 11/3
_____________
A(2, 3); B(-1, 3)
y = ax + b
3 = 2a + b
3 = -a + b
b = 3 + a
3 = 2a + 3 + a
3a = 0
a = 0
b = 3
ecuatia dreptei y = 3
____________________
A(0,5); B(-3, 0)
y = ax + b
5 = a*0 + b
0 = -3a + b
b = 5
3a = b
3a = 5
a = 5/3
ecuatia dreptei y = 5x/3 + 5
