Answer:
x=-7,y=-2
Step-by-step explanation:
2y=-32-4x
y=-16-2x
7x+(-16-2x)=-51
5x-16=-51
5x=-35
x=-7
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Red
Answer:
2.4 cans cost 47.4
If you cannot buy 2.4 cans, you must buy 3 cans, then you'll pay 59.25
Step-by-step explanation:
The lawn has trapezoidal shape, so find the area of the trapezoid using formula

In the diagram, ABED is rectangle, so BE = 12 m, thus ED = 20 m - 12 m = 8 m.
Consider right triangle EDC. By the Pythagorean theorem,

Thue,
Height = 15 m
Find the midline:

Hence,

One can cover
to cover
is needed
cans
One can costs 19.75, so 2.4 cans cost

If you cannot buy 2.4 cans, you must buy 3 cans, then you'll pay

Answer:
12
Step-by-step explanation:
I think the answer is 10...