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y=mx+b 7x+3y=21 3y=21-7x *****_ y=7-2.3x *****_ m= -2.3 negative
are you talking about a system of equations where x+3y=-7 -x+2y=-8 if so, then the answer is {2,-3}
2(7)=3(7) 14=21
7x+3y where x=2 and y=9 can be written as (7*2)+(3*9) which can be simplified to (14)+(27), from there it's basic addition.
5y+14+y = 3y-7 5y+y-3y = -7-14 3y = -21 y = -7