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ololo11 [35]
4 years ago
11

9x-2y=-21 2x+3y=16 Substitution

Mathematics
1 answer:
hjlf4 years ago
3 0
9x-2y=-21 \\\\  9x=-21+2y \\\\ => \boxed{x=\frac{2y-21}{9}} \\\\ 2x+3y=16 \\\\ 2*\frac{2y-21}{9}+3y^{(9}=16^{(9} \\\\ 2(2y-21)+27y=144 \\\\ 4y-42+27y=144 \\\\ 31y=144+42 \\\\ 31y=186 \\\\ \boxed{y=\frac{186}{31}=6} \\\\ x=\frac{2*6-21}{9} \\\\ x=\frac{12-21}{9} \\\\ x=\frac{-9}{9} \\\\ \boxed{x=-1}
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3 years ago
Why do we use scientific notation, and what are the parts of an expression written in scientific notation?
kiruha [24]

Answer:

We use scientific notation as sometimes numbers are so so big, that it becomes inconvenient for us to write the actual number.

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4 0
3 years ago
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Someone help me with these pls?
Eddi Din [679]

Answer:

Step-by-step explanation:

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5 0
3 years ago
Giovanni is visiting her grandmother who lives in an apartment building on the 25th floor. Giovanni enters the elevator in the l
Blizzard [7]
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the want a percentage so 9 out of 25
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a hack for this specific problem is that 25 is exactly 1/4 of 100 so
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of course there is a legit way of solving this problem but this is a hack (this works for factors of 100 like 2,4,5,10,20,25,50)
5 0
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lubasha [3.4K]
It needs only one 360 degree angle to make a full turn
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3 years ago
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