Given that the equations 4x + 5Y = 5; ax + 4Y = - 1 and 3x + y = 9; 3ax + 4BY = 18 have the same solution, find the value of a + B

Given that the equations 4x + 5Y = 5; ax + 4Y = - 1 and 3x + y = 9; 3ax + 4BY = 18 have the same solution, find the value of a + B

Because of the same solution, 4x + 5Y = 53x + y = 9, we can get the same solution first. For the system of equations, x = 40 / 11, y = 9-120 / 11 = - 21 / 11, ax + 4Y = - 1 40a-84 = - 11 3ax + 4BY = 18 120a-84b = 198, we can get a = 73 / 40, B = 1 / 4, so a + B = 73 / 40 + 1 / 4 = 83 / 40

Solve the equations 2 / 3x-y = 0,3x-4y = 2

From Formula 1, y = 2 / 3x is substituted by formula 2, 3x-4 (2 / 3x) = 2, 3x-8 / 3x = 2, 1 / 3x = 2, x = 6, and then y = 4 is substituted by Formula 1

Bridge
Pan Guoben
Always in the water and the earth against the bull, angry, or in the dangerous water, mountain and water do not buy each other, the bridge came. The bridge will lie down, hand firmly on this side, foot solid on the other side, at this time, the two sides of the struggle can not help laughing, gas also all disappeared. There are always bumps in the world, with the bridge, I do not know how many bumps
Bridge is the conscience of the earth. No matter how big or small, how high or low, whether it is made of iron, wood, stone, plastic or any other material, the Tatar people waste their steep mountains and fast flowing water. As long as the bridge is there, it will be difficult for people to see the end of the mountain and the end of the river. The bridge never thinks about it. It only abides by one principle: one day I will no longer bear it, and there will be no iron life
In my childhood, there was a bridge on changjiaogou in the west of the village. It was just a bridge. In fact, it was only three long stones, which were erected on a five or six meter high pier. Its width was so rough, so simple and honest, and it was not decorated or skillful, which made the unreasonable water discharge from Longgang very pleased, The water from Longgang flows happily under the bridge, and the vegetation on both sides withers and flourishes. The men and women of our village come to the city, and the children of the village on the other side come to school. They walk safely across the stone bridge, like walking on the ground, without any hardship
After the collapse in 1959, it was replaced by dike. Later, the village grid became square, and the small stone bridge even disappeared. No one remembered it or mentioned it any more. You know, it never even had a name
Born as a bridge, is to carry people and goods, is to pave the way or show the scenery
This reminds me of my grandmother and the elders in our village. When they were alive, they were all gray and black cloth clothes, like bridges. The burden of the field was on the household, like bridges. They often had no formal names, just such as xiaoyuzi, big eyes, yaolaosi and Laolaizi. They had never done a great thing in their life, and had never said a memorable word, My grandmother, a man who was blind when he was 24 years old, was carrying a family of eight. She was the first to get up every day to do the dirtiest, most tired and most trivial things, and always ate the rotten leftovers, In 1952, she was too sick to carry her grandson. This year, she left quietly
A horse is born to run, a bridge is born to carry
1. What is the spirit of the bridge?
2. In my childhood, why did the bridge at changjiaogou in the west of the village leave a deep impression on me?
3. Talk about the author's intention
4. Talk about the meaning of the words in brackets in the following sentences
① The bridge always comes when the water and the earth are angry, or when the mountain is dangerous and the water is urgent
② It's so crude, so simple and honest, and it's not decorated and skillful, which makes the (unreasonable) discharge from Longgang convinced

1. Praise the bridge selfless, unknown, not afraid of sacrifice, sacrifice for others
2. Because the bridge is selfless and unknown, its quality is as simple and kind as the author's grandmother, giving people a kind of enlightenment
3. The author uses the bridge to praise the simple and selfless dedication of the working people
4. Earthquake flood the author uses personification to write the bridge tolerance and resolve the contradiction between people