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Shalnov [3]
3 years ago
9

Solve the system by either substitution or elimination 3x-5y=21 2x+y=1

Mathematics
1 answer:
Bezzdna [24]3 years ago
3 0
Hello

3x - 5y = 21
2x + y = 1

We need to solve 2x+y=1 for y
So now we have, y = -2x +1

Substitute -2x +1 for y in 3x-5y = 21
3x - 5y = 21
3x -5 (-2x+1)=21
3x + 10x -5=  21
13x -5 = 21
13x = 21+5
13x = 26
x= 26/13
x= 2 
Now we have the value of x, with that we can find the value for y
let's do that by substitute 2 for x in y = -2x +1
y = -2x +1
y= -2(2) +1
y= -4 +1
y= -3

Final answer : Y= -3 and x= 2

I hope that's help !
 
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Expression.is of what number? Write a division expression to match this question.
nirvana33 [79]

3/4 is 1/3 of what number?

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3 0
1 year ago
the problem is kamala had 5,026 grams  flour in a canister.she brought a 4,158 gram bag of flour.she poured some flour from the
andrey2020 [161]
Hello, 

x= amount of flour that she poured in the canister

there was 5,026 grams of flour, and now: 5,026+x

In the bag there was 4,158, now: 4,158

I says that as a result the mass of the flour in the canister is twice the mass of the flour left in the bag, so:

5,026+x=2*(4,158-x) \\ 5,026+x=8,316-2x \\ 3x=8,316-5,026 \\ 3x=3,290 \\ x=1,096.67

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8 0
3 years ago
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ss7ja [257]

Answer:

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<u>-TheUnknownScientist 72</u>

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2 years ago
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