Answer:
Let 2x + y - 10 = 0 be equation (a).
Let x - y - 5 = 0 be equation (b).
Make y the subject in equation (b):
Substitute for y in equation (a):
Find y in any equation of your choice:
−4 x + 10 ≥ 5 x + 55
2 answers:
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Answer:
A:linear function for both :
beach: y=-2x+100 (x=0, y=100)
dunes=5x+20 ( when x=0, y=20 (year1995)
B: after almost 11 years: it will be year 2006 and 2007 (after 11.429 years)
C: when the two rates of erosion are equal at the rate of 77 and almost 11 years
-2x+100=5x+20
-2x-5x=-100+20
-7x=-80
-80/-7=x
x=11.429
y=77.143
