Question

A line is represented by the equation x + 2y = 4. What is the slope and y-intercept?

Answer 1

to get the slope and y-intercept you have to put the equation into slope-intercept Form.

you do that by isolating y
$x + 2y = 4 \\ 2y = - x + 4 \\ y = - \frac{1}{2} x + 2$
the slope of your equation is -1/2 and the y-intercept is 2.