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andriy [413]
3 years ago
5

A. 3(x + y) + 2x, for x = 3 and y = 5 b. 7x + 4 – x + 2, for x = 8

Mathematics
1 answer:
Nostrana [21]3 years ago
8 0

Answer:

a. 30 b. 54

Step-by-step explanation:

a. 3(3+5) + 2(3)

   24 + 6

   30

b. 7(8) + 4 - 8 +2

    56 + 4 - 8 + 2

    56 - 4 +2

    52 + 2

    54

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Step-by-step explanation:

When x=0, y = 2

When y=0, x = 2

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3 years ago
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Find the slope of the line through each pair of points (20,-16),(19-16)
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Answer:

Undefined slope.

Step-by-step explanation:

The formula should be y2 - y1 over x2 - x1

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4 0
2 years ago
Y=x+2 y=-3X <br><br>solve system of equations algebraically <br>​
goblinko [34]

Answer:

(x,y) = -1/2 , 3/2

Step-by-step explanation:

Let y = x +2 ----- (1)

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x = -3x -2

x +3x = -2

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Y = -3 (-1/2)

y = 3/2

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8 0
2 years ago
Solve for |2x + 4|-1=7
Rudik [331]

Answer:

x = - 6 or x = 2

Step-by-step explanation:

The absolute value function always returns a positive value. However, the expression inside can be positive or negative.

Given

| 2x + 4 | - 1 = 7 ( add 1 to both sides )

| 2x + 4 | = 8, thus

2x + 4 = 8 ( subtract 4 from both sides )

2x = 4 ( divide both sides by 2 )

x = 2

OR

-(2x + 4) = 8

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- 2x = 12 ( divide both sides by - 2 )

x = - 6

As a check

Substitute these values into the left side of the equation and if equal to the right side then they are the solutions.

x = 2 → | 4 + 4 | - 1 = | 8 | - 1 = 8 - 1 = 7 ← True

x = - 6 → | - 12 + 4 | - 1 = | - 8 | - 1 = 8 - 1 = 7 ← True

Hence the solutions are x = - 6 or x = 2

6 0
3 years ago
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