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3 years ago

Can someone help me please

Mathematics

1 answer:

Zina [86]3 years ago

5 0

2 solutions I believe.

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Solve using Elimination<br><br> 3x+y=-9<br> y=5x+7

valentinak56 [21]

Answer

x=-2 and y=-3

Step-by-step explanation:

Step: Solvey=5x+7for y:

Step: Substitute5x+7 for y in 3x+y=−9:

3x+y=−9

3x+5x+7=−9

8x+7=−9(Simplify both sides of the equation)

8x+7+−7=−9+−7(Add -7 to both sides)

8x=−16

8x/8=−16/8

(Divide both sides by 8)

x=−2

Step: Substitute−2 for x in y=5x+7:

y=5x+7

y=(5)(−2)+7

y=−3(Simplify both sides of the equation)

7 0

3 years ago

Convert from Decimal Notation to Scientific Notation

umka21 [38]

Answer:

Hence, 0.026 can be expressed as $2.6 \times 10^{-2}$ .

Step-by-step explanation:

- Given 0.026

- Use given, move the decimal point so that first factor is greater than or equal to 1 but less than 10 .

- Then count n and write in scientific notation.

Step 1 of 1

Consider 0.026

$\Rightarrow 2.6$

Decimal has moved 2 places to right.

The power will be negative as original no. is less than 1 .

$\begin{aligned}&2.6 \times 10^{-2} \\&0.026=2.6 \times 10^{-2} .\end{aligned}$

6 0

2 years ago

3. Penny's family decided to go to the Splash Park.

Anestetic [448]

Answer:

21.25

Step-by-step explanation:

because 85$ divided by the 4 tickets is 21.25

6 0

3 years ago

Which algae has larger mass at 3 hours , in kilograms

pychu [463]

Answer:

i need more information on this

3 0

2 years ago

Find the midpoint of the line segment that has endpoints at (10,8) (-3,-10)

dem82 [27]

Hey there! :)

Answer:

(3.5, -1).

Step-by-step explanation:

Use the midpoint formula to solve this problem:

$(x_m, y_m) = (\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2})$

Plug in the coordinates given:

$(\frac{10-3}{2}, \frac{8-10}{2})$

Simplify:

$(\frac{7}{2}, \frac{-2}{2})$

Therefore, the coordinates of the mid-point are:

(3.5, -1).

7 0

3 years ago