5x+2y= -8
Here's one method :
Let x = 0 ...so we have
5(0) + 2y = -8
0 + 2y = -8
2y = -8 divide both sides by 2
y = -4 so....we have the point (0, -4) on the graph
Next...let y = 0 and we have
5x + 2(0) = -8
5x = -8 divide both sides by -5
x = -8/5 so......the point (-8/5, 0) is also on the graph
Plot the two points and draw a line through them......that's your graph....!!!