Sign In
Ask Question
Jacob Shepherd
Mathematics
29 December, 00:06
1. 3x+y=5
2x-y=10
2. 2x+2y=3
X-4y=-1
+3
Answers (
2
)
Jillian Spence
29 December, 00:12
0
1. X=5 and Y=-15
2. X=1 and Y=0.5
Comment
Complaint
Link
Ireland Hernandez
29 December, 00:34
0
1. Since y in first equation is positive and y in second equation is negative, the easiest was to solve this system is:
3x+y+2x-y=5+10
5x=15
x=3
Now use the x to find y:
3*3+y=5
9+y=5
y=5-9
y=-4
2. You can either multiply the first equation by 2 so that we get the same numbers in front of the y but with different signs or simply express one of the variables and write it in second one.
First way:
2x+2y=3 / *2 (multyplying by 2)
4x+4y=6 (that's our first equation)
x-4y=-1 (that's our second equation)
now we just add the equations:
4x+4y+x-4y=6 + (-1)
5x=6-1
5x=5
x=1
now we find y:
1-4y=-1
-4y=-1-1
y=-2/-4
y=1/2
Second way:
We express x from the second equation and get:
x=-1+4y
now we change x in the first equation with our new x:
2 * (-1+4y) + 2y=3
-2+8y+2y=3
10y=5
y=1/2
x=-1+4 * (1/2)
x=-1+2
x=1
Comment
Complaint
Link
Know the Answer?
Answer
Not Sure About the Answer?
Find an answer to your question 👍
“1. 3x+y=5 2x-y=10 2. 2x+2y=3 X-4y=-1 ...”
in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers
You Might be Interested in
Gina has 400 records. If Johnny were to double the number of records that he now owns, he would still have fewer than Gina has.
Answers (1)
For what value of x would the expression below be undefined? 8/6x
Answers (1)
when you subtract one negative integer from another will your answer be greater than or less than integer you started with? Explain your reasoning and give example.
Answers (1)
What is the inverse of y=9x^2-4
Answers (1)
What does 3-3x6+2 equal?
Answers (2)
New Questions in Mathematics
Which statements are always true regarding the diagram? Select three options. m25 + m23 = m_4 m23 + m 24 + m25 = 180° m25 + m26 = 180° m_2 + m23 = hizo m 2 + m23 + m25 = 180°
Answers (1)
What is 7x5+9 (2x9) 2+3 (8+6) 5-=___?
Answers (2)
You do you solve systems of equations by subsitution
Answers (1)
Solve for b. 6b + 5a = 7b - 2a + 3 -7a + 3 7a-3 A. b = B. b = 13 13 C. b = 7a - 3 O D. b = - 7a + 3
Answers (1)
Mr. Schwartz builds toy cars. He begins the week with a supply of 85 wheels, and uses 4 wheels for each car he builds. Mr. Schwartz plans to order more wheels once he has fewer than 40 wheels left.
Answers (1)
Home
»
Mathematics
» 1. 3x+y=5 2x-y=10 2. 2x+2y=3 X-4y=-1
Sign In
Sign Up
Forgot Password?