Answer:
The Answer is: The first number is 5 and the second one is 8.
Step-by-step explanation:
Let f = first number and s = second number
Twice the first number added to the second number is 18:
2f + s = 18
The second number is equal to 4 times the first number minus 12:
s = 4f - 12
Substitute:
2f + (4f - 12) = 18
6f - 12 = 18
6f = 18 + 12
6f = 30
f = 5, is the first number.
Solve for the 2nd number:
s = 4(5) - 12 = 20 - 12 = 8, is the second number.
Proof:
2f + s = 18
2(5) + 8 = 18
18 = 18
Hope this helps! Have an Awesome Day! :-)
Answer:
24!
Step-by-step explanation:
a= h b/2
a = 4 12/2
12/2 = 6
a = 4 x 6
a = 24
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First make x the subject of the relation:-
f(x) = 2x - 4
2x = f(x) + 4
x = (f(x) + 4) / 2
Now replace x by the inverse f-1(x) and f(x) by x :-
f-1(x) = (x + 4) / 2
Answer:
y=-1
Step-by-step explanation:
5x + 3y = 12 ....(*)
4x - 5y = 17....(**)
multiply (*) by : -4 and(**) by 5
you have : -20x -12 = -48.....(1)
20x -25y = 85....(2)
add(1) and(2) : -37y = 37 so : y =37/-37= -1