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Svetach [21]
3 years ago
15

If x² - y² = 55, and x - y = 11, then y = a. 8 b. 5 c. 3 d. -8 e. -3

Mathematics
1 answer:
irina1246 [14]3 years ago
7 0
X^2-y^2=55
this means that 
(x+y)(x-y)=55
we know that x-y=11 so we can write
(x+y)(11)=55
x+y=55/11 we divide by 11 and we obtain 
x+y=5

x-y=11 this means
x=y+11 we replace in the other equation (x+y=5)

y+11+y=5
2y=5-11
2y=-6
y=-3
and you find out that also 
x=8

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4 0
3 years ago
What is the value of a in the equation 5a – 10b = 45, when b = 3?
lara31 [8.8K]
Here you go. Do you think that you could help me with my question

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8 0
3 years ago
Read 2 more answers
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x = 12.8

Step-by-step explanation:

i use this calculator to find triangle measurements as long as you know like three values it works

https://www.calculator.net/triangle-calculator.html?vc=90&vx=&vy=10&va=38&vz=&vb=&angleunits=d&x=79&y=19

ik sending a link is hecka sus but you can just look up triangle calculator and it'll pop up

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Step-by-step explanation:

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