7 mu, 2 mu
2、
A: y 1=5x.
B: y2=kx+b
The points (1, 7) and (5, 23) are replaced.
7=k+b
23=5k+b
The solution is k=4 and b=3.
That is y2=4x+3.
When 5x=4x+3
That is, when x=3
y 1=y2
A: After 3 hours, the irrigated acres of Team A are equal to those of Team B..