Question

I just need someone to check if these are correct? Please & Thanks.

1. Use the substitution method to solve the system of equations.
x + 2y = 15
2x – 3y = 2

a. (2, 4)
b. (4, 7)
c. (7, 4) <---- i chose
d. (4, 2)

2. When using the substitution method, what expression for y in the second equation would be substituted in the first equation?
2x – 2y = –12
4x – y = 3

a. –4x – 3
b. –4x + 3
c. 4x – 3 <--- i chose
d. 4x + 3

Answer 1

3. Use the elimination method to solve the following system of equations.
2x + 4y – 3z = –7
3x + y + 4z = –12
x + 3y + 4z = 4

a. (–6, –2, –1) <---- i chose
b. (6, –2, –1)
c. (–6, 2, –1)
d. (–6, 2, 1)


4. Use the substitution method to solve the following system of equations.
x + 2y – z = 7
4x – y + 3z = –2
2x + 2y – z = 9

a. (2, 1, 3)
b. (2, 1, –3) <---- i chose
c. (–2, 1, –3)
d. (–2, –1, 3)

Answer 2

questions 1 2 and 4 are correct
Check the ques 3 again
@bombshellbri

Answer 3

thank you. and i tried it again, would it be -6, 2, 1? @ash2326

Answer 4

correct:D

Answer 5

Yes! Thanks again (: