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lions [1.4K]
3 years ago
7

If the first equation is multiplied by 3 and then the equations are added, the result is _____.

Mathematics
1 answer:
tensa zangetsu [6.8K]3 years ago
7 0
When you multiply the first equation by 3, you get:
3 × 3x = 9x
3 × y = 3y (but when added, that part gets eliminated)
3 × 3 = 9
So you end up with
9x + 3y = 9
x - 3y = -2
(add)
10x = 7

So your answer is B. 10x = 7. I hope this helps!
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Which list correctly orders A, B, and C from least to greatest when A= |7|, B = _6, and C = |-5|?
zheka24 [161]

Answer:

D. B,C,A

Step-by-step explanation:

A= |7|=7

B= -6

C= |-5|=5

so this means that B<C<A = -6<5<7

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8 0
3 years ago
The length of segment HJ if H lies at (-1,7) and J lies at (8,-5)​
sukhopar [10]

Answer:

<h3>HJ = 15</h3>

Step-by-step explanation:

To get the length of segment HJ if H lies at (-1,7) and J lies at (8,-5)​, we will use the formula for calculating the distance between two points as shown;

D = √(x₂-x₁)²+(y₂-y₁)²

From the coordinates x₁ = -1, y₁ = 7, x₂ = 8, y₂ = -5

HJ = √(8-(-1))²+(-5-7)²

HJ = √(8+1)²+(-12)²

HJ = √81+144

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HJ = 15

<em>Hence the length of segment HJ is 15 units</em>

5 0
3 years ago
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