To find the x-intercept of that line, we have to make that information to equation. Withe that information, we can make the slope-intercept form which is y = mx+ b.
To put that information into that form, we can get
y = -3x + 3
To find the x-intercept, we have to set y = 0 and solve the equation
0 = -3x + 3
0 - 3 = -3x + 3 - 3
-3 = -3x
-3 / -3 = -3x/-3
So the answer is 1