Question

determine a equaçao da reta na forma y = ax +b,
A = (1 : 5) e B = (-2 : -7).
C = (1 : 2 ) e D =(3 : -2).​

Answer 1

Explicação passo-a-passo:

A = (1 : 5) e B = (-2 : -7)

+1a+1b=5 .(2)

-2a+1b=-7

__________

+2a+2b=10

-2a+1b=-7

_________

2b+b=10-7

3b=3

b=3/3

b=1

a=5-b = 5 -1 = 4

Y=ax+b

Y=4x+1

C = (1 : 2 ) e D =(3 : -2)

1a+1b=2 .(-3)

3a+b=-2

________

-3a-3b=-6

+3a+1b=-2

_________

-3b+1b=-6-2

-2b=-8

b=-8/-2

b=4

a+b=2

a=2-b

a=2-4

a=-2

Y=ax+b

Y=-2x+4