Answer :
5x+2y=7
y=x-7
5x=7-2y
5x=7-2(x-7)
5x=7-2x+14
5x+2x=7+14
7x/7=21/7
x=3
y=x-7
y=3-7
y=-4
Answer is B
y=x-7
5x=7-2y
5x=7-2(x-7)
5x=7-2x+14
5x+2x=7+14
7x/7=21/7
x=3
y=x-7
y=3-7
y=-4
Answer is B
