All categories

3 years ago

y=5x+23, -2x-y=5 i need help with this, it’s solving by substitution. i don’t get it someone pls help

Mathematics

2 answers:

Anna71 [15]3 years ago

7 0

You just put the y=5x+23 in -2x-y=5
-2x-(5x+23)=5
-2x-5x-23=5
-7x=5+23
-7x=28
X=-4

madam [21]3 years ago

4 0

Answer: if this doesn't help u let me know and i can explain more have a good day <3

x=−4 and y=3

Step-by-step explanation:

Step: Solvey=5x+23for y:

y=5x+23

Step: Substitute5x+23foryin−2x−y=5:

−2x−y=5

−2x−(5x+23)=5

−7x−23=5(Simplify both sides of the equation)

−7x−23+23=5+23(Add 23 to both sides)

−7x=28

−7x/−7=28/−7

(Divide both sides by -7)

x=−4

Step: Substitute−4 for x in y=5x+23:

y=5x+23

y=(5)(−4)+23

y=3(Simplify both sides of the equation)

Answer:

x=−4 and y=3

You might be interested in

you are designing a rectangular flower bed that you will border using brick paverst. the width of the border aaround the bed wil

Alex777 [14]

a) Polynomial equation that represents total area can be written as,

as per figure,

dimension are as follows,

Length = $( 5 + 2x)$ , Breadth = $(6 + 2x)$

∴ Area = Length x Breadth = $(5+2x)$ x $(6+2x)$

So we get equation as,

$4x^{2} +10x+12x+30$ = $4x^{2} +22x+30$

b) Total area of flower bed when width of border is 1.5 feet

width of border is value of x

∴ x = 1.5 feet

by substituting value of x in equation we get,

Total area = 9 + 33 + 30 = 72 feet

4 0

3 years ago

Need answer asap, will give brainliest

lilavasa [31]

Answer:

Answer is A 35

Step-by-step explanation:

Hope this helps

7 0

3 years ago

Read 2 more answers

The Law of Demand is one of the most famous laws in economics. It states that when the price of a good rises, the amount demande

skelet666 [1.2K]

Falls, rises

if it is the ONLY cable provider, then it is a monopoly

3 0

3 years ago

Which shows the expression below in simplified form? (7 × 10-3) - (2.3 × 10-6) A. 6.9977 × 10-3 B. 6.99977 × 10-3 C. 6.9977 × 10

rosijanka [135]

Option A

$(7 \times 10^{-3}) - (2.3 \times 10^{-6}) = 6.9977 \times 10^{-3}$

Solution:

Given expression is:

$(7 \times 10^{-3}) - (2.3 \times 10^{-6})$

To evaluate the expression, let us make the exponent of 10 same

$2.3 \times 10^{-6} = 0.0023 \times 10^{-6+3} = 0.0023 \times 10^{-3}$

[ Here, decimal point is moved three times left, so add 3 ]

Therefore,

$(7 \times 10^{-3}) - (2.3 \times 10^{-6}) = (7 \times 10^{-3}) - (0.0023 \times 10^{-3})$

$\text{Take the } 10^{-3} \text{ as common }$

$(7 \times 10^{-3}) - (0.0023 \times 10^{-3}) = 10^{-3}(7-0.0023)\\\\\text{ Solve for terms inside the bracket }\\\\(7 \times 10^{-3}) - (0.0023 \times 10^{-3}) = 10^{-3} \times 6.9977\\\\\text{Therefore, the simplified expression is: }\\\\(7 \times 10^{-3}) - (0.0023 \times 10^{-3}) = 6.9977 \times 10^{-3}$

Thus Option A is correct

6 0

4 years ago

Use multiplication to find 2 equivalent fractions, 1/4 1/6

Feliz [49]

Answer:

2/8 4/16

2/12 3/18

Step-by-step explanation:

7 0

2 years ago