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If a+b=−2a + b = -2a+b=−2a+b= -2 and x+y =−2 what is 4x+5a+4y+5b?
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If a+b=−2a + b = -2a+b=−2a+b= -2 and x+y =−2 what is 4x+5a+4y+5b?

User Natalie Adams
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a + b = -2\ and\ x + y = -2\\\\4x + 5a + 4y + 5b = (4x + 4y) + (5a + 5b) = 4(\underbrace{x + y}_(=-2)) + 5(\underbrace{a + b}_(=-2))\\\\=4(-2)+5(-2)=-8+(-10)=-18

User Xpros
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