a . 3x-2y = 4z b . 6xy+9 = 0°c .+4y = 6° d . 4x =

2. In the following equations, belongs to the binary linear equations is ().

A.

3. Binary linear equation 5a- 1 1b = 2 1 ()

A. There is only one solution B. There are countless solutions C. There is no solution D. There are only two solutions.

4. The common * * solution of equations Y = 1-X and 3x+2y=5 is ().

A.

5. If │ x-2 │+(3y+2) 2 = 0, the value of is ().

A.- 1 B- 2c-3d。

6. If the solution of the equation is, then A and B are ().

A, B, C, D,

7.| 3a+b+5 |+2a-2b-2 | = 0, then the value of 2a2-3ab is ().

a、 14 B、2 C 、-2 D 、-4

8, when solving the equation, the relatively simple method is ()

A, substitution method B, addition and subtraction method C, trial and error method D, uncertainty

9. A store has two earphones with different purchase prices. One is sold in 64 yuan, with a profit of 60% and a loss of 20%. In this transaction, this store ().

A, 8 yuan B, 32 yuan C, D, 8 yuan.

Second, fill in the blanks

1. It is known that the equation 2x+3y-4 = 0, y is represented by an algebraic expression containing x: y = _ _ _ _ _ _ x is represented by an algebraic expression containing y: x = _ _ _ _ _ _ _

2. In the binary linear equation -x+3y = 2, when x=4, y = _ _ _ _ _ _ _ when y =- 1, x = _ _ _ _.

3. If x3m-3-2yn- 1 = 5 is a binary linear equation, then m = _ _ _ _, and n = _ _ _.

4. Given that it is the solution of the equation X-KY = 1, then k = _ _ _ _ _ _

5. If x- 1 │+(2y+ 1) 2 = 0 and 2x-ky = 4, then k = _ _ _ _.

6. The positive integer solution of binary linear equation x+y=5 has _ _ _ _ _ _ _ _.

7. A binary linear equation whose solution is _ _ _ _ _ _ _.

8. For the known solution, then m = _ _ _ _ _ _ and n = _ _ _ _ _ _