5(x-9)=6(y-2)

Simplify:

3x+4y= 16 5x-6y=33

De: 19x= 1 14。

That is, x=6.

Substitute x=6 into 3x+4y= 16 to get y=-0.5.

Verify that x=6 and y=-0.5 conform to the original equation.

So x=6, y=-0.5 is the solution of the meta-equation.

Question 2: Because the perimeter is 18cm, a+b+c= 18.

A+b=2c is converted into a+b-2c=0.

A-b=c/2 is converted into a-b-c/2=0, and 2a-2b-c=0 is obtained.

The ternary linear equation can be solved a=7.5 b=4.5 c=6.

Question 3: The solution is reciprocal, that is, y =-x. If you bring this into the first equation, you can get x= 1.

So y=- 1, and when these two numbers are brought into the second equation, K can be solved, so k=3.

Question 4: Bring A into the equation and get 3a-2b=2 c=-2.

By bringing the wrong solution of student B into an equation ax+by=2, an equation about A and B can be obtained.

-2a-2b=2

Then solve the binary linear equation 3a-2b = 2a-2b = 2 about A and B (because the value of C is misspelled

The first equation has no c value, so it does not affect the first equation)

a=4 b=5 c=-2