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Zanzabum
3 years ago
9

Evaluate each expression if x=-2,y=-3and z=5. 2x+3y+z?

Mathematics
1 answer:
maw [93]3 years ago
7 0

Answer:

Step-by-step explanation:

Substitute the variable with the number

2(-2) + 3(-3) + 5

-4 - 9 + 5

-13 + 5 = -8

You might be interested in
a line passes through the point (-3,-5) and has a slope of 5 write an equation in point slope form for this line
Tanzania [10]

Answer:

y=5x+10

Step-by-step explanation:

1) Plug numbers into slope formula to find b.

y=mx+b

-5=5(-3)+b

2) Simplify to find b.

-5=-15+b

10=b

3) Check work.

-5=-15+10

This statement is true.

4) Write equation.

y=5x+10

4 0
2 years ago
NEED HELP
solmaris [256]

The solutions to the systems of equations are:

1. (2, 3) (see attachment below). [one solution]

2. no solution

3. (3, 13) [one solution]

<h3>Solution to a System of Equations?</h3>

The solution to a system of equations is the x-value and y-value that will make both equations true. It can be found either using a graph, by elimination method, or substitution method as explained below.

1. Using graph to solve y = 2x - 1 and y = 4x - 5:

The solution is the point where both lines intersect which is: (2, 3) (see attachment below). [one solution]

2. Solving using substitution method:

x = -5y + 4 ---> eqn. 1

3x + 15y = -1 ---> eqn. 2

Substitute x = -5y + 4 into eqn. 2

3(-5y + 4) + 15y = -1

-15y + 12 + 15y = -1

-15y + 15y = -1 - 12

0 = -13 (this shows that there is no solution)

3. Using elimination method:

14x = 2y + 16 ---> eqn. 1

5x = y + 2 ---> eqn. 2

1(14x = 2y + 16)

2(5x = y + 2)

14x = 2y + 16 ----> eqn. 3

10x = 2y + 4 -----> eqn. 4

Subtract

4x = 12

x = 12/4

x = 3

Substitute x = 3 into eqn. 2

5(3) = y + 2

15 = y + 2

15 - 2 = y

13 = y

y = 13

The solution is: (3, 13).

Learn more about the solution of a system of equations on:

brainly.com/question/13729904

#SPJ1

5 0
2 years ago
Use the distrubutive property to simply 2(-5-7j)
prisoha [69]

<u>Answer:</u>

2(-5 - 7j) = -10 - 14j

<u>Step-by-step explanation:</u>

Using the distributive property means that we have to multiply both -5 and -7j by 2:

2(-5 - 7j)

⇒ 2 × -5  +  2 × -7j

⇒ -10 - 14j

8 0
2 years ago
Practice
TEA [102]

Answer:

B. -0.5

Step-by-step explanation:

I calculated it logically

4 0
3 years ago
Your friend George is 6 feet tall and his shadow is 10 feet long. At the same time, the shadow of the flagpole was 85 feet long.
Leokris [45]

Answer:

51 feet

Step-by-step explanation:

Let

x -----> the height of a flagpole

we know that

Using proportion

\frac{6}{10}=\frac{x}{85} \\\\x=6*85/10\\\\x=51\ ft

8 0
3 years ago
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