Help me with this one pls

What is always true when two whole numbers are subtracted?

Will mark the brainliest. paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?

What is y-5=3(x+1) in slope intercept form