Answer:
diff- 45
Step-by-step explanation:
x=6/7 and y=18/7
If y = 3x and 2x + 4y = 12,
then substitute the value of y with 3x
2x + 4(3x) = 12
2x+12x=12
14x=12
x=12/14=6/7
y=3x=3*(6/7)=18/7
lenght = 2x + 3
breadth = x - 1
perimeter = 40
Now,
perimeter = 2(l+b)
40= 2( 2x + 3 + x - 1)
40= 2(3x - 2)
40 = 6x- 4
40+4 =6x
44/6 =x
x = 7.33
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