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The graph of the equation 2x + y = -3 is a straigth line.

the formula is;

y=mx+b

where 'm' is the slope

'b' is the y intercept.

To graph of this equation you can also trial and error.Assign the vaue of either X or Y by Zero .Say,

y=-2x-3 ------that is the equation above.Im just only into the form above.

Let: Let:

Y=0 X=0

0=-2X-3 Y=2(0)-3

X=-3/2 Y=-3

(-3/2,0) (0,-3)

Therefore the coordinates are:

(-3/2,0) & (0,-3)

Then, plot on the Cartesian plane.

Hope it helps.:)