1. Given that the sum of the unknowns X and Y in the system of equations 3x + 5Y = m + 2 is 0, find the index of M and the solution of the system of equations 2x+3y=m 2. When solving the system of equations ax + by = 21, student a misread the sign of B, so the solution is x = 5 cx+y=19 y=-1 Student B missed C and got the solution x = 3. Try to find the solutions of a, B and C y=2, 3. After a shopping mall bought two kinds of clothes, both of them were sold at a price increase of 40%. During the Spring Festival, it was decided to sell the two kinds of clothes at 20% and 10% discount respectively. A customer paid 182 yuan for the two kinds of clothes, and the sum of the two kinds of clothes was 210 yuan. How much was the purchase price and the price of the two kinds of clothes? How many questions can you answer

1. Given that the sum of the unknowns X and Y in the system of equations 3x + 5Y = m + 2 is 0, find the index of M and the solution of the system of equations 2x+3y=m 2. When solving the system of equations ax + by = 21, student a misread the sign of B, so the solution is x = 5 cx+y=19 y=-1 Student B missed C and got the solution x = 3. Try to find the solutions of a, B and C y=2, 3. After a shopping mall bought two kinds of clothes, both of them were sold at a price increase of 40%. During the Spring Festival, it was decided to sell the two kinds of clothes at 20% and 10% discount respectively. A customer paid 182 yuan for the two kinds of clothes, and the sum of the two kinds of clothes was 210 yuan. How much was the purchase price and the price of the two kinds of clothes? How many questions can you answer

1.3x+5y=m+2
2(x+y)+x+3y=m+2
x+3y=m+2 -----A
2x+3y=m
(x+y)+x+2y=m
x+y= m-------B
A-B got the following results
2y=2
y=1
Substituting y = 1 into 3x + 5Y = m + 2 and 2x + 3Y = m
The equations are: 3x + 5 = m + 2
2x+3=m
The solution is x = 0, M = 3
3. Let a purchase price be X Yuan and b purchase price be y yuan
That is, there is a system of equations: 1.4 * 0.8x + 1.4 * 0.9Y = 182
1.4x+1.4y=210
The solution is: x = 50, y = 100
50 * 1.4 = 70 (yuan) 100 * 1.4 = 140 (yuan)
A: the purchase price of Party A is 50 yuan and the price is 70 yuan. The purchase price of Party B is 100 yuan and the price is 140 yuan
I can only find out that C equals 4... A, B, I can't ask