y = mx + b slope(m) = -3/11 (-5,1)...x = -5 and y = 1 now we sub and find b, the y int 1 = -3/11(-5) + b 1 = 15/11 + b 1 - 15/11 = b 11/11 - 15/11 = b -4/11 = b equation in slope int form : y = -3/11x - 4/11 3/11x + y = - 4/11....multiply by 11 3x + 11y = -4 <== standard form
(4,-2)(4,8).....if u will notice, both the x values are the same. This means the lines are vertical with an undefined slope. Your equation is : x = 4.