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3 years ago

What is -7x+2y=-23 y=-8x+23

1 answer:

6 0

Steps:I will try to solve your system of equations.
y=−8x+23;−7x+2y=−23
Step: Solve y=−8x+23 for y: Step:
Substitute−8x+23 for y in −7x+2y=−23:
−7x+2y=−23−7x+2(−8x+23)=−23−23x+46=−23(Simplify both sides of the equation)−23x+46+−46=−23+−46(Add -46 to both sides)−23x=−69−23x−23=−69−23(Divide both sides by -23)x=3Step: Substitute 3 for x in y=−8x+23:y=−8x+23y=(−8)(3)+23y=−1(Simplify both sides of the equation)
Answer:y=−1 and x=3

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-1/2 + (3/4times4/9)=

zimovet [89]

Answer:-1/6

Step-by-step explanation:

-1/2 + (3/4times4/9)

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3 years ago

A negative angle or a positive angle may be used to represent the same thing.

miss Akunina [59]

Answer:

1.Sometimes

Step-by-step explanation:

If it is π it represents samething otherwise it does not.

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3 years ago

2 A pharmacist has a 13 % alcohol solution and another 18 % alcohol solution. How much of each must he use to make 50 grams of a

nalin [4]

<h2>Therefore he took 40 gram of $1^{st}$ type solution and 10 gram of $2^{nd}$ type solution.</h2>

Step-by-step explanation:

Given that , A pharmacist 13% alcohol solution another 18% alcohol solution .

Let he took x gram solution of $1^{st}$ type solution

and he took (50-x) gram of $2^{nd}$ type solution.

Total amount of alcohol = $[x\times\frac{13}{100}] +[(50 -x) \times\frac{18}{100} ]$ gram

Total amount of solution = 50 gram

According to problem

⇔ $\frac{ [x\times\frac{13}{100}] +[(50 -x) \times\frac{18}{100} ]}{50}= \frac{14}{100}$

⇔ $\frac{13x +900-18x}{100\times50} =\frac{14}{100}$

⇔- 5x= 700 - 900

⇔5x = 200

⇔x = 40 gram

Therefore he took 40 gram of $1^{st}$ type solution and (50 -40)gram = 10 gram of $2^{nd}$ type solution.

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4 years ago

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KATRIN_1 [288]

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3 years ago

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Verify that -(x+y)=(-x)+(-y) when x=3/4 and y=2/5

frosja888 [35]

Answer:

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3 years ago