Answer:
B. a = 5
Step-by-step explanation:
3(a - 4) + 1 = 9 - a
Distribute the 3 into the parenthesis.
3a - 12 + 1 = 9 - a
Add -12 and 1.
3a - 11 = 9 - a
Add a to both sides.
4a - 11 = 9
Add 11 to both sides.
4a = 20
Divide both sides by 4.
a = 5.
Proof:
3(a - 4) + 1 = 9 - a
Substitute variable.
3(5 - 4) + 1 = 9 - 5
Subtract inside parenthesis.
3(1) + 1 = 9 - 5
Multiply 3 and 1.
3 + 1 = 9 - 5
Add 3 and 1.
4 = 9 - 5
Subtract 5 from 9.
4 = 4.
-10x - 3y = -18
(1)
-7x - 8y = 11 (2)
Multiply equation (1) by 8 and equation (2) by -3
-80x - 24y = -144
(1)
21x + 24y = -33 (2)
-------------------------------Add
-59x = -177
x = 3
Plug in x = 3 into -10x-3y=-18
-10(3) -3y =-18
-30 - 3y = -18
3y = -12
y = -4
Answer
(3, - 4)
So, said you drive your car 15,000m/year and you produce 250 gallon from each acre of corn you grow, your car use 1 gallon per 20miles.
15,000 m/year
250 gallons = 1 acee
20 Mile = 1 gallon
Total gallon = 15,000/20
Total gallon = 750
Since 1 acre is 250 gallons.
Total acre = 750/250
Total acre = 3
You need to have 3 acre to go 15,000 m/year.
Answer:
d.
Step-by-step explanation:
I just know.