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S_A_V [24]
3 years ago
14

What is the value of y in the solution to the system of equations?x y = 12x – 3y = –30

Mathematics
2 answers:
zhenek [66]3 years ago
8 0
X + y = 12 . . . . . . . . (1)
x - 3y = -30 . . . . . . . (2)
(1) - (2): 4y = 42
y = 10.5
arlik [135]3 years ago
4 0

Answer:

y=10.5

Step-by-step explanation:

we have

x+y=12 ------> equation A

x-3y=-30 ------> equation B

Multiply by -1 equation A

-1*(x+y)=-1*12 -------> -x-y=-12 ------> equation C

Adds equation B and equation C

x-3y=-30\\-x-y=-12\\ -----------\\-3y-y=-30-12\\-4y=-42\\y=42/4\\ y=10.5

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ipn [44]

Answer:

Neither

Step-by-step explanation:

After substituting the ordered pair into the equation, none of the pairs satisfy the equation

because 6(3)+3(-2)=12 and 6(2)+3(2)=18.

8 0
3 years ago
If f(x) = 2x ^ 2 + 5 squreroot(x - 2) complete the following statement
lubasha [3.4K]

Answer:

hello :

Step-by-step explanation:

f(x) = 2x²+5√(x-2)

f(x) exist : x - 2 ≥ 0  :  x ≥ 2

The domain for f(x) is all real numbers "greater" than   or equal to 2

7 0
2 years ago
Jasmine borrowed $15,000 for 8 years and she paid $6,600 in interest. What was the interest rate for Jasmine's loan?
weeeeeb [17]

Answer:

5.5%

Step-by-step explanation:

To find the interest rate, use the equation:  I = prt

I = Interest = $6,600

p = principal = $15,000

r = rate = unknown

t = time = 8 years


Now plug the numbers into the equation.

6,600 = 15,000 * r * 8

6,600 = 120,000 * r


Now isolate the variable by dividing both sides of the equation by 120,000.

0.055 = r


Now change the rate to a percent by moving the decimal point 2 digits to the right.

5.5% = r   OR   r = 5.5%

4 0
2 years ago
4[3(10-7)+(11•2)]<br><br> Help please
Yuri [45]
Answer: 124

Explanation: 4[3(10-7)+(11•2)]
Parentheses - 4[3(3)+(22)]
Parentheses - 4(9+22)
Parentheses - 4(31)
Multiplication - 124
8 0
2 years ago
Read 2 more answers
As I was going to St. Ives
cluponka [151]

Answer:

the answer should be 2,401 were going to St. Ives

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
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