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jeyben [28]
3 years ago
10

Simplify the expression (3.5x - 2.7y) + (-12.8x + 15.8y)

Mathematics
1 answer:
baherus [9]3 years ago
5 0

Answer:

-9.3x + 13.1y

Step-by-step explanation:

(3.5x - 2.7y) + (-12.8x + 15.8y) = 3.5x - 2.7y - 12.8x + 15.8y =

= 3.5x - 12.8x - 2.7y + 15.8y = (3.5 - 12.8)x - (2.7 - 15.8)y =

= -(12.8 - 3.5)x + (15.8 - 2.7)y = -9.3x + 13.1y

because

-(-a) = a

-(a + b) = -a - b

-(a - b) = -a + b = b - a

a + (-b) = a - b

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