MATHEMATICS HIGH SCHOOL

What is the y intercept of 2x - y = -1

Answers

Answer 1
Answer:

Answer:

1

Step-by-step explanation:

You have to rewrite this into slope intercept.

Find Y

2x-y=-1\n\n-y=-1-2x\n\n(-y=-1-2x)/(-1) \ny=1+2x

Therefore, the y intercept is 1

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Increase £64 by 70%??????

Answers

I'm not sure if you used the euro sign accidentally or what but this is how to increase 64 by 70%

divide 64 by 10.
6.40
then multiply it by 7.
44.80
then add 44.8 to your original number. (64)
the answer is:
108.8

If you did put that sign there purposely and if it means something then I don't know if it matters or if this is right.

Peter paid $12.83 for a dvd. The price of the dvd was $11.98. How much sales tax did peter pay?

Answers

Peter paid 0.85 tax which is at 7.1% sales tax

A sequence is defined that the first term is 4 and each term after the first term is found by adding 4 5 to the preceding term. What is the 8th term of the sequence?

Answers

The 8th term of the sequence is 9.6
Hope this helped! :)

HELP PLEASEEEE!!The math team decided to sell customized pocket protectors as a
fundraiser. These were truly a hot item in our school, and $240 was
raised. Cecily had originally suggested a price that was $2 lower
for each item, but if the team had agreed to that price they would have
had to sell 20 more pocket protectors to get the $240.
How many pocket protectors did they actually sell? What was the price of
each?

Answers

Answer:

40

Step-by-step explanation:

6×40⇒240

Mike is three times as old as his little sister, Mary. In 4 years, he will be twice as old as Mary. How old is Mary?

Answers

x-the age of Mike
y-the age of his sister

x=3y

x+4=2(y+4)
3y+4=2y+8
3y-2y=8-4
y=4 years

x=3*4=12 years
Mary: x yrs old
Mike: 3x yrs old

In four yrs:

Mary: x+4 yrs old
Mike: 3x+4 yrs old

As the text of task:

3x+4=2(x+4)
3x+4=2x+8
3x-2x=8-4
x=4

Mary is 4 yrs old

How do you substitute x+7y=0 into 2x-8y=22

Answers

First solve for x in the first equation

x + 7y = 0
x = -7y

since x = -7y we can substitute -7y into the other equation wherever there is an x

2x - 8y = 22
2(-7y) - 8y = 22
-14y - 8y = 22
-22y = 22
y = -1

Now let's substitute -1 back into either of the original equations so we can solve for x

x + 7y = 0
x + 7(-1) = 0
x - 7 = 0
x = 7

So your solution set is

(7, -1)
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