Answer:
[tex]x = - 3[/tex]
Step-by-step explanation:
Use the slope-intercept form to find the y-intercept, using the complete ordered pair you're given.
[tex]y = mx + c \\ \\ (1) = (1)(4) + c \\ 1 = 4 + c \\ c = - 3[/tex]
Then, knowing the y-intecerpt, use the slope-intercept form again, now with the incomplete pair, and solve for x.
[tex]y = mx + c \\ \\ ( - 6) = (1)x - 3 \\ - 6 = x - 3 \\ x = - 3[/tex]
Therefore,
[tex]x = - 3[/tex]
