Question

(2,-1)
y-intercept -3
slope 1/2

Write an equation with the given info above.

Answer 1

y-intercept -3  

slope 1/2

is sufficient info with which to write an equation for a straight line:

y = mx + b becomes y = (1/2)x - 3.

You should check this by determining whether or not (2,-1) satisfies this equation.