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ale4655 [162]
3 years ago
12

A variable needs to be eliminated to solve

Mathematics
1 answer:
lesya692 [45]3 years ago
6 0

Answer:

(7, - 7 )

Step-by-step explanation:

- 4x + y = - 35 → (1)

- 2x - y = - 7 → (2)

adding the 2 equations term by term will eliminate the y- term

(- 4x - 2x) + (y - y) = - 35 - 7

- 6x + 0 = - 42

- 6x = - 42 ( divide both sides by - 6 )

x = 7

substitute x = 7 into either of the 2 equations and solve for y

substituting into (1)

- 4(7) + y = - 35

- 28 + y = - 35 ( add 28 to both sides )

y = - 7

solution is (7, - 7 )

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svetoff [14.1K]
∠n = ∠p

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by adding the two equations

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Mary has some trading cards. Julie has 3 times as many trading cards as Mary. They have 36 trading cards in all. Which of these
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Answer:

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The longer leg of a right triangle is 3 inches more than the length of the shorter leg tripled. the hypotenuse is 3 inches less
lukranit [14]
We have this equation.
A²+B²=C²
We have bits of information that'll help us simplify the equation so there's only one variable.
The longer leg, A, is 3 inches more than the length of the shorter leg, B, tripled.
A=3B+3
Let's plug that in.
(3b+3)²+B²=C²
The hypotenuse, C, is 3 inches less than four times the length of the shorter leg. C=4B-3
Let's plug that in.
(3b+3)²+B²=(4B-3)²
Let's solve.
9B²+18B+9+B²=16B²-24B+9
10B²+18B+9=16b²-24b+9
Let's subtract 9 from both sides.
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Let's subtract 10b² from both sides.
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Let's add 24b from both sides.
42b=6b²
Let's divide each side by 6.
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The shorter leg is 7 inches.
Now, let's look back at the bits of information.
The longer leg of a right triangle is 3 inches more than the length of the shorter side tripled.
3(7)+3=24
So, the longer side is 24. We can either use the other information or plug it into the equation. We can do both. 
The hypotenuse is 3 less than four times the shorter leg.
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7²+24²=
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√625=25
So, the length of the hypotenuse is 25 inches.
4 0
3 years ago
(3m2 + 5m - 2) + (-2m +18)?
sergeinik [125]

Answer:

3m^{2}+3m+16

Step-by-step explanation:

Start with:

(3m^{2} +5m-2)+(-2m+18)\\

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3m^{2}+3m+16

3 0
3 years ago
Read 2 more answers
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meriva
0.15 is bigger, this is because the 0.05 in 0.15 has more value than 0.02 in 0.125, even though it has a third digit.
6 0
3 years ago
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