D'naisa mixed her favorite shade of orange paint. she had 1 gallon of orange paint and added 2 quarts of yellow paint and 3 pints of red paint. how many quarts of paint did d'naisa mix? 1 gallon =4 quarts 1 quart =2 pints

If one gallon equals 4 quarts then the first part of the equation would be 4+
Next, if you have 2 quarts of paint, the equation would become 4+2
And lastly, if you have 3 pints of red paint, that would become 1.5 quarts. So your final equation would be 4+2+1.5= 7.5 quarts of paint.
    
     Final 7.5 quarts

You could plug them all in... but a faster way:

add the 2 equations together.

You would get:
4x = 8 (the 2y and -2y cancel out)
x = 2

Plug x back into one of the equations.
x + 2y = 3
2 + 2y = 3
2y = 1
y = 1/2

So... B (2, 1/2)