1. ( 1, -2 ) ( -2, 1 ) ( -1, 1 ) ( 1, 1 ) ( t, 2t - 3 ) ( t, -1t - 2 )
Solve the system, or show that it has no solution. If the system has infinitely many solutions, express your answer as an ordered pair in the form ( t , f ( t ) ) , where x = t and y = f ( t ). {image} Select the correct answer.
( 1, -2 )
( -2, 1 )
( -1, 1 )
( 1, 1 )
( t, 2t - 3 )
( t, -1t - 2 )
No solution 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. Solve the system, or show that it has no solution
Solve the system, or show that it has no solution. If the system has infinitely many solutions, express your answer as an ordered pair in the form ( t , f ( t ) ) , where x = t and y = f ( t ). {image} Select the correct answer.
( -1, 4 )
( t, 2t + 1 )
( 5, -1 )
( 3, -1 )
( 4, 0 )
( 3, 1 )
No solution 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. Solve the system, or show that it has no solution
Solve the system, or show that it has no solution. If the system has infinitely many solutions, express your answer as an ordered pair in the form ( t , f ( t ) ) , where x = t and y = f ( t ). {image}
{image} 1. 2. 3. 5. 4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

4. A man has 13 coins in his pocket, all of which are dimes and quarters
A man has 13 coins in his pocket, all of which are dimes and quarters. If the total value of his change is $2.65, how many dimes and how many quarters does he have? Choose the correct answer from the following:
4 dimes, 9 quarters
9 dimes, 4 quarters
7 dimes, 8 quarters
6 dimes, 10 quarters 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

5. A biologist has two brine solutions, one containing 15% salt and another containing 25% salt. How many milliliters of each solution should he mix to obtain 1 L of a solution that contains 17% salt? Choose the correct answer from the following.
800 milliliters of the first brine solution, 200 milliliters of the second brine solution
200 milliliters of the first brine solution, 800 milliliters of the second brine solution
750 milliliters of the first brine solution, 250 milliliters of the second brine solution
850 milliliters of the first brine solution, 150 milliliters of the second brine solution 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50