Understanding First Degree Equation Systems

The video tutorial on the Gis channel introduces the first degree equation system and demonstrates solving it using the substitution method. The instructor presents two problem situations: one involving cheese bread and coffee, and another with dogs and chickens. The video explains how to set up equations with two unknowns and solve them step-by-step using substitution. The lesson concludes with an invitation to watch the next class on the addition method.

What is the primary focus of the lesson introduced in the video?

• Understanding geometric shapes

• Learning the first degree equation system

• Exploring advanced calculus

• Studying historical mathematics

Which method is used to solve the system of equations in the cheese bread and coffee problem?

• Graphical method

• Elimination method

• Substitution method

• Matrix method

In the cheese bread and coffee problem, what do the variables x and y represent?

• x is the total cost, y is the number of items

• x is the number of items, y is the total cost

• x is cheese bread, y is coffee

• x is coffee, y is cheese bread

What is the first step in solving the cheese bread and coffee problem using the substitution method?

• Graph the equations

• Isolate one variable

• Multiply the equations

• Add the equations

What is the value of each coffee in the cheese bread and coffee problem?

• 3 reais

• 4 reais

• 1 real

• 2 reais

In the dogs and chickens problem, what do the variables c and g represent?

• c is the number of legs, g is the total number of animals

• c is the total number of animals, g is the number of legs

• c is the number of dogs, g is the number of chickens

• c is the number of chickens, g is the number of dogs

How many heads are there in total in the dogs and chickens problem?

• 6

• 8

• 10

• 12

What is the total number of feet in the dogs and chickens problem?

• 18

• 24

• 20

• 22

How many chickens are there in Giovana's backyard according to the solution?

• 4

• 7

• 5

• 3

What is the final step in solving the dogs and chickens problem using the substitution method?

• Multiply the equations

• Add the equations

• Verify the solution

• Graph the solution