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GarryVolchara [31]
3 years ago
11

When doing substitution what is the answer for -9x+2y=228, -7x-1=y

Mathematics
2 answers:
tiny-mole [99]3 years ago
8 0

Answer:

do u need to solve for x

Step-by-step explanation:

anyanavicka [17]3 years ago
7 0

Answer: x = -10, y = 69

Step-by-step explanation:

-9x+2y=228 -------------- eqn,. 1

-7x-1=y ---------------- eqn. 2

from eqn. 2 make y subject formula i.e.

y = -7x -1

substitute for y in eqn. 1

-9x + 2(-7x-1) = 228

-9x -14x - 2 = 228

collect like terms

-23x = 228 + 2

-23x = 230

x = 230/-23

x = - 10

substitute for x in eqn. 2

y =-7(-10) -1

y = 70-1

y = 69

Hence, x = -10, y = 69

kindly rate brainliest

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