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Fofino [41]
3 years ago
6

Use inverse operations to solve the equation k + 7.2 = 3.4

Mathematics
1 answer:
STALIN [3.7K]3 years ago
3 0

Answer:

-3.8

Step-by-step explanation:

-3.8+7.2=3.4

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I need answer on this graphing va substitution.Problem 7 I tried to solve it but not sure that’s correct
Bond [772]

Given the system of equations:

\begin{gathered} 2x+9y=27 \\ x-3y=-24 \end{gathered}

To solve it by substitution, follow the steps below.

Step 1: Solve one linear equation for x in terms of y.

Let's choose the second equation. To solve it for x, add 3y to each side of the equations.

\begin{gathered} x-3y=-24 \\ x-3y+3y=-24+3y \\ x=-24+3y \end{gathered}

Step 2: Substitute the expression found for x in the first equation.

\begin{gathered} 2x+9y=27 \\ 2\cdot(-24+3y)+9y=27 \\ -48+6y+9y=27 \\ -48+15y=27 \end{gathered}

Step 3: Isolate y in the equation found in step 2.

To do it, first, add 48 to both sides.

\begin{gathered} -48+15y=27 \\ -48+15y+48=27+48 \\ 15y=75 \end{gathered}

Then, divide both sides by 15.

\begin{gathered} \frac{15y}{15}=\frac{75}{15} \\ y=5 \end{gathered}

Step 4: Substitute y by 5 in the relation found in step 1 to find x.

\begin{gathered} x=-24+3y \\ x=-24+3\cdot5 \\ x=-24+15 \\ x=-9 \end{gathered}

Answer:

x = -9

y = 5

or (-9, 5)

Also, you can graph the lines by choosing two points from each equation, according to the picture below.

7 0
1 year ago
What is the answer to this question
ASHA 777 [7]
Round 5.49 down to 5.00
Round 10.98 to 11.00
20.00-5.00-11.00=4.00
the answer would be a.
8 0
3 years ago
Ava and Kendra want to estimate the height of a tree. On a sunny day, Ava measures Kendra's shadow as 3 meters long, and Kendra
wolverine [178]

Answer:

7.5 metres

Step-by-step explanation:

height : shadow

1.5 : 3

X : 15

X/15 = 1.5/3

X = 15/2

X = 7.5

3 0
3 years ago
Perform the given set operation. Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. (Enter your answers as a comma-separated list. Enter E
vaieri [72.5K]

Answer:

More information i will help

Step-by-step explanation:

3 0
3 years ago
Can a ray be bisected?
34kurt

Such a ray that divides an angle into two equal angles is called an angle bisector.

Likewise, two rays that divide an angle into three congruent angles are called angle trisectors. Figure %:

An angle bisected and trisected On the left, angle ABC is bisected by the ray BD.

Credits to google.

In short, no.

8 0
4 years ago
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