iibabycarrotsii
20.03.2020 •
Mathematics
Terry sees this offer. refurbished phne355off now only £78. how much was the phone before the discountes price?
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Ответ:
Step-by-step explanation:
Ответ:
10x=18-2(4x+9)
10x=18-8x-18
10x=-8x
18x=0
x=0
now plug 0 in for x:
y=4(0)+9
y=9
to check, plug x and y back into one of the equations to make sure they are right:
10(0)=18-2(9)
0=18-2*9
0=18-18
0=0