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zaharov [31]
3 years ago
10

If x-y=10 and x squared-y squared =40 then y=?

Mathematics
2 answers:
77julia77 [94]3 years ago
6 0
Solve for y in the first equation
-y=-x+10
y=x-10

Now substitute y in the second equation
x^2-(x-10)^2=40
x^2-(x^2-20x+100)=40
20x-100=40
20x=140
x=7

Plug the value of 7 in to any of the equations
7-y=10
y=(-3)

Final answer: y= -3
melomori [17]3 years ago
5 0
12 I know I gave you the wrong answer
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The sum of two numbers is 76 and their difference is 52. Find the two numbers.<br> Please explain
Yanka [14]

Step-by-step explanation:

hope it helps first find one number and then multiply one number by 2

6 0
2 years ago
2) Brian purchased pens for 75 cents each and pencils for 40 cents each he bought total of 22 writing utensils for $11.95. How m
d1i1m1o1n [39]

Answer:

13 pencils.

Step-by-step explanation:

Let x be the pens and y be the pencils

Given:

Brian purchased pens for 75 cents each and pencils for 40 cents each he bought total of 22 writing utensils for $11.95.

Total pens and pencils is 22

So, x+y=22----------------(1)

And he bought all utensils for $11.95. and each pen for 75 cents and pencils for 40 cents.

0.75x+0.40y=11.95------------(2)

solve equation 1 and equation 2 for x and y.

From equation 1.

x+y=22

y=22-x----------------(3)

put y value in equation 2.

0.75x+0.4(22-x)=11.95

0.75x+0.4\times 22-0.4x=11.95

0.75x+8.8-0.4x=11.95

0.75x-0.4x=11.95-8.8

0.35x=3.15

x=\frac{3.15}{0.35}

x=9

Now substitute x value in equation 3.

y=22-9

y=13

So, he buy 13 pencils.

5 0
3 years ago
Add. Write your answer in simplest form. HELP ASAP!
elena-s [515]
It’s 3 and 2/3 is the answer
6 0
2 years ago
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If 18 gallons of gasoline cost $23.31 how much would 12 gallons cost
FinnZ [79.3K]

Answer:

15.60

Step-by-step explanation:

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7 0
2 years ago
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Kay [80]
To solve this, you know that both values listed (4x - 3 and -3x + 4) are equal to y, so you know that they also must be equal to each other! Therefore you can form the following equation:

4x - 3 = -3x + 4

Now you can add -3x to both sides to combine like terms:

7x - 3 = 4

Now add 3 to both sides:

7x = 7

Now if you divide everything by seven, you see that x = 1. Now that we have out x value, we can go ahead and plug it into one of the equations. This gives us:

y = 4(1) - 3

If we multiply out, we get:

y = 4 - 3
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So y also equals 1! Now that we have our answers, we can simply put them into an ordered pair which should be in the form of (x value, y value.)

Our final answer will be (1, 1).

Hope this helps!
8 0
3 years ago
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