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Setler [38]
3 years ago
11

Solve the system by substitution. x+y=3 y=x? -5x -5 -

Mathematics
1 answer:
Alinara [238K]3 years ago
8 0
X= 8/3, y= 17/3


Double check to see if it’s the right answer
You might be interested in
Find two consecutive integers such that the sum of their squares is 145.
DiKsa [7]

Answer: 8 and 9 or -9 and -8

Step-by-step explanation:

Let x be the first of the two integers. Then, since the numbers are consecutive, x+1 is the other integer. We then know that the sum of the squares of x and x+1 is equal to 145. So, now we have the equation

x^2+(x+1)^2=145

which can be expanded and simplified to

2x^2+2x+1=145

which then gives us the quadratic equation

2x^2+2x-144=0

This can then be factored into

2(x^2+x-72)=0

Which can be simplified further into

2(x-8)(x+9)=0

So either x=8 or x=-9. This gives us two solutions: 8 and 9 or -9 and -8.

Hope this helps! CHEERS!

7 0
4 years ago
Find all the polynomials f (t ) of degree ≤ 2 [of the form f (t) = a + bt + ct2] whose graphs run through the points (1, 3) and
Ugo [173]

Answer:

f(t) = 4 - 3t + 2t^2

Step-by-step explanation:

Given:

f(t) = a + bt + ct^2

Differentiate w.r.t. "t"

f'(t) = b + 2ct

1) f(1) = 3

a + b +c = 3...........1)

2) f(2) = 6

a + 2b + 4c = 6.........2)

3) f'(1) = 1

b + 2c = 1 ...............3)

Solving above three simultaneous equations:

a = 4

b = -3

c = 2

Therefore equation becomes:

f(t) = 4 + (-3)t + (2)t^2

3 0
3 years ago
Kennedy buys cell phone cases for $4.50 and sells them to her friends for $18.00. What is the percent mark-up?
lidiya [134]
300% markup is the answer
7 0
3 years ago
Help me solve it ,thank you.
tiny-mole [99]
I'm sorry try to reread what you learnt in class
I'm not up to this yet
4 0
3 years ago
The diagonal of a rectangle is 25 in. The width is 15 in. What is the area of the rectangle?
lord [1]

The area of the rectangle would be 375

7 0
3 years ago
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