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
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