Question 1 :
Solve for t :
5t - 9 = -3t + 7
Question 2 :
Solve for x :
3x - 1 = x + 5
Question 3 :
Solve for n :
3n/4 + 16 = 2 - n/8
Question 4 :
Solve for n :
4(2a - 1) = -10(a - 5)
Question 5 :
Solve for x :
-7x - 3x + 2 = -8x - 8
Question 6 :
Solve for k :
5(k - 3) - 7(6 - k) = 24 - 3(8 - k) - 3
Question 7 :
Solve for x :
(x + 15)(x - 3) - (x2 - 6x + 9) = 30 - 15(x - 1)
Question 8 :
Solve for x :
4x/5 - 7/4 = x/5 + x/4
Question 9 :
Solve for x :
(x - 2)/2 + (x + 10)/9 = 5
Question 10 :
Solve the following equation :
(1/2)(8y - 6) = 5y - (y + 3)
Question 11 :
Solve the following equation :
2(1 - x) + 5x = 3(x + 1)
Question 12 :
David's Rental Car charges an initial fee of $20 plus an additional $30 per day to rent a car. Alex's Rental Car charges an initial fee of $36 plus an additional $28 per day. For what number of days is the total cost charged by both of them the same?
1. Answer :
5t - 9 = -3t + 7
Add 3t to each side.
8t - 9 = 7
Add 9 to each side.
8t = 16
Divide each side by 8.
t = 2
2. Answer :
3x - 1 = x + 5
Subtract x from each side.
2x - 1 = 5
Add 1 to each side.
2x = 6
Divide each side by 2.
x = 3
3. Answer :
3n/4 + 16 = 2 - n/8
Least common multiple of the denominators (4 and 8) is 8.
Multiply each side by 8 to get rid of the denominators 4 and 8.
8[3n/4 + 16] = 8[2 - n/8]
Use the distributive property.
8(3n/4) + 8(16) = 8(2) - 8(n/8)
6n + 128 = 16 - n
Add n to each side.
7n + 128 = 16
Subtract 128 from each side.
7n = -112
Divide each side by 7.
n = -16
4. Answer :
4(2a - 1) = -10(a - 5)
Use the distributive property.
4(2a) - 4(1) = -10(a) - 10(-5)
8a - 4 = -10a + 50
Add 10a to each side.
18a - 4 = 50
Add 4 to each side.
18a = 54
Divide each side by 18.
a = 3
5. Answer :
-7x - 3x + 2 = -8x - 8
Simplify.
-10x + 2 = -8x - 8
Add 10x to each side.
2 = 2x - 8
Add 8 to each side.
10 = 2x
Divide each side by 2.
5 = x
6. Answer :
5(k - 3) - 7(6 - k) = 24 - 3(8 - k) - 3
Use distributive property.
5k - 15 - 42 + 7k = 24 - 24 + 3k - 3
Simplify.
12k - 57 = 3k - 3
Subtract 3k from each side.
9k - 57 = -3
Add 57 to each side.
9k = 54
Divide each side by 9.
k = 6
7. Answer :
(x + 15)(x - 3) - (x2 - 6x + 9) = 30 - 15(x - 1)
Simplify.
x2 + 12x - 45 - x2 + 6x - 9 = 30 - 15x + 15
18x - 54 = -15x + 45
Add 15x to each side.
33x - 54 = 45
Add 54 to each side.
33x = 99
Divide each side by 33.
x = 3
8. Answer :
4x/5 - 7/4 = x/5 + x/4
The least common multiple of the denominators (4 and 5) is 20.
Multiply each side by 20 to get rid of the denominators 4 and 8.
20[4x/5 - 7/4] = 20[x/5 + x/4]
20(4x/5) - 20(7/4) = 20(x/5) + 20(x/4)
16x - 35 = 4x + 5x
16x - 35 = 9x
Subtract 9x from each side.
7x - 35 = 0
Add 35 to each side.
7x = 35
Divide each side by 7.
x = 5
9. Answer :
(x - 2)/2 + (x + 10)/9 = 5
The least common multiple of the denominators (2 and 9) is 18.
Multiply each side 18 to get rid of the denominators 2 and 9.
18[(x - 2)/2 + (x + 10)/9] = 18(5)
18(x - 2)/2 + 18(x + 10)/9 = 90
9(x - 2) + 2(x + 10) = 90
9x - 18 + 2x + 20 = 90
11x + 2 = 90
Subtract 2 from each side.
11x = 88
Divide each side by 11.
x = 8
10. Answer :
(1/2)(8y - 6) = 5y - (y + 3)
Simplify both sides.
4y - 3 = 5y - y - 3
4y - 3 = 4y - 3
Subtract 4y from each side.
-3 = -3
The above result is true. Because the result we get at the last step is true, the given equation has infinitely has many solutions.
11. Answer :
2(1 - x) + 5x = 3(x + 1)
Simplify both sides.
2 - 2x + 5x = 3x + 3
2 + 3x = 3x + 3
Subtract 3x from each side.
2 = 3
The above result is false. Because 2 is not equal to 3. Because the result we get at the last step is false, the given equation has no solution.
12. Answer :
Let x be the number of days for which the total cost charged by both of them is same.
Step 1 :
Write an expression using 'x' representing the total cost of renting a car from David’s Rental Car.
Total cost = Initial fee + cost for "x" days
Total days = 20 + 30x
Step 2 :
Write an expression using 'x' representing the total cost of renting a car from Alex’s Rental Car.
Total cost = Initial fee + cost for 'x' days
Total days = 36 + 28x
Step 3 :
We have assumed that the total cost charged by both of them is same for 'x' number of days.
So, we have
20 + 30x = 36 + 28x
Step 4 :
Solve for 'x'.
20 + 30x = 36 + 28x
Subtract 28x from each side.
20 + 2x = 36
Subtract 20 from each side.
2x = 16
Divide each side by 2.
x = 8
So, the total cost charged by both of them is same for 8 days.
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