Question

determine a equação geral da reta que passa pelos pontos A(1-4) e B(2-1)​

Answer 1

$y = ax + b\\\\A(1, 4) \Rightarrow 4 = 1.a + b\\B(2, 1) \Rightarrow 1 = 2.a + b\\\\a + b = 4\\2a + b = 1\\\\-a = 3\\a = -3\\\\-3 + b = 4\\b = 7\\\\y = -3x + 7$