Question

Please help I need practice on this but I don't understand this concept, so please explain your answer. I really want to understand but my teacher didn't explain it clearly. I will mark brainliest for the best answer, with an explanation. Please don't put a link or type in a random answer. I really legitimately need help. Thanks to anyone who gives an answer. :D - Luna
Solve using elimination.

–3x + y = 15
–3x + 7y = –3

(_,_)

Answer 1

Answer:

x=-6 and y=-3

mrk me brainliest plz

Step-by-step explanation:

Step: Solve−3x+y=15 for y:

−3x+y=15

−3x+y+3x=15+3x (Add 3x to both sides)

y=3x+15

Substitute 3x+15 for y in−3x+7y=−3:

−3x+7y=−3

−3x+7(3x+15)=−3

18x+105=−3(Simplify both sides of the equation)

18x+105+−105=−3+−105 (Add -105 to both sides)

18x=−108 divide both side by 18

x=-6

Answer 2

Answer:

(-4 + 3)

Step-by-step explanation:

–3x + y = 15

(-1) –3x + 7y = –3

–3x + y = 15

+ 3x - 7y = 3

6y = 18

/6     /6

y = 3

–3x + 3 = 15

      - 3    -3

-3x = 12

/-3    /-3

x = -4