Answer:
a=-4, b=-4. (-4, -4).
Step-by-step explanation:
-3a+7b=-16
-9a+5b=16
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-3(-3a+7b)=-3(-16)
-9a+5b=16
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9a-21b=48
-9a+5b=16
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-16b=64
b=64/-16
b=-4
-3a+7(-4)=-16
-3a-28=-16
-3a=-16+28
-3a=12
a=12/-3
a=-4
Answer:
Convert both to improper fractions
1 4/5 = (1*5 + 4)/5 = (5+4)/4 = 9/5
12 1/3 = (12*3 + 1)/3 = (36+1)/3 = 37/3
Find a common denominator - 15
9/5 = 27/15
37/3 = 185/15
Add them together
27/15 + 185/15 = 212/15
So 212/15 Gallons is needed.
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