Solve by graphing

Question

Solve by graphing: 2x + y =-4

                               y=2

Answer 1

Any problem of this type requires graphing very accurately using a sharp pencil.

 

For the first line, plot the line by finding its two intercepts i.e. when x=0, what's y, & vice versa)--two points are sufficient to graph.  Hint: this line will have negative slope.

 

For the second line, it's horizontal, 2 units above the x-axis, passing through 2 on the y-axis (slope = 0).

 

Read the coordinates of the point of intersection & write as an ordered pair.  Done!