biba54
07.09.2021 •
Mathematics
A rectangular farm measuring 300 m by 240 m was fenced all round leaving a 4 m space for a gate. How many poles were used if the intervals were 4 metres apart?
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Ответ:
Step-by-step explanation:
multiply the first equation by 5 and the second by 2
5(3x+2y=-7)
2(2x-5y=8)
15x+10y=-35
4x-10y=16
add them
19x=-19
divide both sides by 19
x=-1
bring the value of x in either equation 1 or 2
in 1
3(-1)+2y=-7
-3+2y=-7
2y=-7+3
2y=-4
divide both sides by 2
y=-2