Answer:
4x - y = 7.
Step-by-step explanation:
We substitute for x and y and see if they fit.
4x - y = 7
4(2) - 1 = 7
So it is the first line.
Answer: First option.
Step-by-step explanation:
To find which line contains the point (2,1), we can substitute the coordinates into each equation of the line provided in the options:
First option:
[tex]4x-y=7\\4(2)-1=7\\7=7[/tex]
It contains the point (2,1)
Second option:
[tex]2x+5y=4\\2(2)+5(1)=4\\9\neq 4[/tex]
It does not contain the point (2,1)
Third option:
[tex]7x-y=15\\7(2)-1=15\\13\neq15[/tex]
It does not contain the point (2,1)
Fourth option:
[tex]x+5y=21\\2+5(1)=21\\7\neq 21[/tex]
It does not contain the point (2,1)
