Problem solving process:

2 x+3 y = 7

+3 y = 7-2 x Step 65438 +0: Move the constant term 2 x to the right and change the sign to-2 x;

3-y = 7-2-x Step 2: Perform the left +3-y = 3-y operation;

Y = 2.333333-0.666667x Step 3: Divide both sides of the formula by 3 at the same time to change the unknown coefficient into1;

Problem solving process:

Y = 1

-4 y = 1-3 2X step 1: the constant term 2X is shifted to the right and the sign is changed to-3 2x;

Y =-0.25+0.75x Step 2: Divide both sides of the formula by -4 at the same time to change the unknown coefficient into1;

2.

Problem solving process:

M+n+n-m = 2。

Step 1 of m of +n+n = 2-3 of 4: shift the term of m of constant term to the right and change the sign to m of -3;

4 +n+n = 2-3m+m Step 2: Move the constant term of 3 m to the right and change the sign to-3 m; Constant term -m shifts the term to the right, and the sign is changed to+m;

N+4 n = 2-3 m+m Step 3: Carry out the left +n+4 n = n+4 n operation;

4m+3 n = 12

+1/3 n = 12-4M Step 1: shift the constant term 4M to the right and change the sign to-4m;

N = 12-4m。 Step 2: perform the left +N = N = 3 operation;

N = 4- 1.333333m Step 3: divide both sides of the formula by 3 at the same time to change the unknown coefficient into1;

Hope to adopt! ! ! !