nkh69
30.01.2021 •
Mathematics
Solve simultaneous equations 4x+3y=7 3x-2y=18 what does x and y =
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Ответ:
8x+6y=14
Multiply the second equation by 3
9x-6y=54
Add the resulting equations together to eliminate the y terms
17x= 68
x= 4
4(4)+3y=7
3y=-9
y=-3
(x,y) = (4,-3)
Ответ:
45in²
Step-by-step explanation:
P = 28
l = w + 4
Use the equation for perimeter:
P = 2l + 2w
P = 2(w+4) + 2w
P = 2w + 8 + 2w
P = 4w + 8
Since we know P=28, we can solve for w.
P = 4w + 8
28 = 4w + 8
4w = 20
w = 5
Substitute w=5 into the length formula
l = w + 4
l = 5 + 4
l = 9
With l=9 and w=5, find the area using the area formula for rectangle.
A = lw
A = (9)(5)
A = 45
The area of the rectangle is 45 squared inches.