X + 5y = 1 . . . . (1)
8x - 2y = 3 . . . .(2)
Solution 1.
From (1), x = 1 - 5y
substituting for x in (2), we have:
8(1 - 5y) - 2y = 3
8 - 40y - 2y = 3
8 - 42y = 3
42y = 5
y = 5/42
x = 1 - 5(5/42) = 1 - 25/42 = 17/42.
Solution 2.
Multiply (1) by 8, to get:
8x + 40y = 8 . . . . . (3)
(3) - (2) = 40y - (-2y) = 8 - 3
42y = 5
y = 5/42
substitute for y into (3), to get:
8x + 40(5/42) = 8
8x + 100/21 = 8
8x = 8 - 100/21 = 68/21
x = (68/21)/8 = 17/42
Answer:
Each board should be 2.15 ft long
Step-by-step explanation:
6.45 ft ÷ 3 boards = 2.15 ft for each board
Yes because division always makes numbers smaller. For example: 12 divided by 4 equals 3.
1) 2/3x , 2t , -1/3x
.
2) 2/3(3m^4 + 6) - (m^4 - m)
{ 3 and 3 get cancelled }
= 2m^4 + 6 - m^4 + m
= m^4 + 6 + m
.
Hope it helps! :)
Answer:
One isosceles triangle
Step-by-step explanation: