kittykat5105
03.06.2020 •
Mathematics
What is the x-value that solves the system 4x-y=21 and y=3x-7
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Ответ:
x=14
Step-by-step explanation:
4x-y=21
y=3x-7
Substitute the second equation in for y in the first
4x - (3x-7) = 21
Distribute the minus sign
4x -3x +7 = 21
x +7 = 21
Subtract 7 from each side
x+7-7=21-7
x=14
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