if a=3x-5y b=6x+3y and c=2y-4x find a+b-c and 2a-3b +4c
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2
Answer:
1. 5x
2. -28x-11y
Step-by-step explanation:
1. a+b+c
=3x-5y+6x+3y+2y-4x
=3x+6x-4x-5y+3y+2y
=9x-4x-5y+5y
=5x
2. 2a-3b+4c
=2(3x-5y)-3(6x+3y)+4(2y-4x)
=6x-10y-18x-9y+8y-16x
=6x-18x-16x-10y-9y+8y
=6x-34x-19y+8y
=-28x-11y
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