Question

What is the y intercept of Y = 3x - 4?

Answer 1

in y = mx + b form, the y intercept can be found in the b position

y = mx +  b
y = 3x + (-4)

so ur y intercept is -4

Answer 2

$\bf \begin{array}{llll} y=&mx&+b\\ &\uparrow &\ \uparrow \\ &slope&y-intercept \end{array}\qquad \begin{array}{llll} y=&3x&-4\\ &&\ \uparrow \end{array}$