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seraphim [82]
2 years ago
7

Solve the following system of equations by Substitution. 5x + 4y = 7 -2x - 2y = 8

Mathematics
2 answers:
kolezko [41]2 years ago
7 0

Answer:

y = 9/13

Step-by-step explanation:

x = -4 + y

5(-4 + y) + 4y = 7

-20 + 9y = 7

9y = -13

mariarad [96]2 years ago
3 0

Answer:

5x + 4y = 7 × -2

-2x - 2y = 8 × 5

-10x - 8y = -14

-10x - 10y = 40

Step-by-step explanation:

2y = -54 ÷2

y = -27

Now substitute the value of y into equation (1)

5x + 4y = 7

5x + 4(-27) = 7

5x = 7 + 108

5x = 115

X = 23

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Wittaler [7]
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2 years ago
Alright i have 4 separate questions to ask for this one i will label them number one through 4 so you don't get mixed up
CaHeK987 [17]

Answer:

1: C. $3,474.38

2: B. $44.10

C: C. $570

Step-by-step explanation:

1.

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2 years ago
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3 years ago
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Consider the equation 3a+0.1n=123. If we solve this equation for n, which equation would result? A. 0.1n=123-3a B. N=123-3a-0.1
neonofarm [45]

Answer:

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Step-by-step explanation:

Given:

3a + 0.1n = 123

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