val4218
08.02.2021 •
Mathematics
X=y-8 and -x-y=0 solve by substitution
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Ответ:
y=4
Step-by-step explanation:
x=y-8
-x-y=0
-(y-8)-y=0
Distribute the negative
-y+8-y=0
Combine the like terms
-2y+8=0
-8 (to both sides)
-2y=-8
Divide by -2
y=4
Ответ:
15x^2+5x
Step-by-step explanation: