|| Equations in two unknowns ||

Solving first degree equations in two unknowns

Exercises

For each question, click on the box corresponding to your answer, and then click on the 'Submit Answer' button.

1- Solve
E1 3x+2y = -4
E2 x+2y = 0
x = 1 and y = -1/2 x = -2 and y = 1 Neither of these answers is correct.
     


2- Solve
E1 2x - 3y = 2
E2 3x + 2y = 3
x = 1 and y = 0 x = 11/13 and y = -4/39 Neither of these answers is correct.
     


3- Solve
2x + y = 0
4x + 3y = -1
x = 2 and y = -4 x = -1/2 and y = 1 x = 1/2 and y = -1
     


4- Solve
2x + y = 3
4x + 2y = 5
x = 0 and y = 0 x = 0 and y = 3 This system has no solution.
     


5- Solve
s - 3t = 15
2s + t = 2
s = 3 and t = -4 s = 9/7 and t = 96/21 Neither of these answers is correct.
     


6- Solve
x + y = 6
x - y = 2
x = 10 and y = 8 x = -10 and y = -8 x = 10 and y = 16
     


7- Solve
2p = 5 -3q
7q = 11 -4p
p = 4 and q = -1 p = 1 and q = 1 Neither of these answers is correct.
     


8- Solve
0,4x - 0,6y = 0,6
0,8x + 1,2y = -0,4
Impossible to solve. x = 1/2 and y = -2/3 x = 2 and y = 1/3
     


9- Solve
- = 1
+ = -9
a = -12 and b = 0 a = 0 and b = -12 Neither of these answers is correct.
     


10- The sum of two numbers is equal to 6, and twice the first number minus the second number is also equal to 6.
Find the two numbers.
3 and 3 2 and 4 9 and -3
  


|| Equations in two unknowns ||