B. 13 (x - 10) = -4 Answer: x = Its a neg #

1 answer:

5 0

X=9.69
you have to distribute the 13 to x and -10 which gives you 13x-130=-4 then you add 130 to -4 because your going over the equal sign and it gives you 126 next you divide 126 by 13 which gives you 9.69

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General Formulas and Concepts:

Order of Operations: BPEMDAS

Equality Properties

Step-by-step explanation:

Step 1: Define equation

P = a + b + c

Step 2: Solve for a

Subtract b on both sides: P - b = a + c
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Solve the following system:
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{4 x - y = -4 | (equation 1)
2 x - y = -7 | (equation 2)
Subtract 1/2 × (equation 1) from equation 2:
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0 x - y/2 = -5 | (equation 2)
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{4 x - y = -4 | (equation 1)
0 x+y = 10 | (equation 2)
Add equation 2 to equation 1:
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Divide equation 1 by 4:
{x+0 y = 3/2 | (equation 1)
0 x+y = 10 | (equation 2)
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Proof 15.

Solve the following system:
{5 x + 7 y = 32 | (equation 1)
8 x + 6 y = 46 | (equation 2)
Swap equation 1 with equation 2:
{8 x + 6 y = 46 | (equation 1)
5 x + 7 y = 32 | (equation 2)
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Divide equation 1 by 2:
{4 x + 3 y = 23 | (equation 1)
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0 x+y = 1 | (equation 2)
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0 x+y = 1 | (equation 2)
Divide equation 1 by 4:
{x+0 y = 5 | (equation 1)
0 x+y = 1 | (equation 2)
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