Equation With Variables

the difference between two number is 40. form a linear equation from above situation.

• x - y = 40

• x + y =40

• x = 40y

• y = 40x

• yes 

• no

• not sure

• yes 

• no

• not sure

What branch of mathematics deals with equations with variable?

• Algebra

• Geometry

• Calculus

• Physics

What branch of mathematics deals with equations with variables?

• Algebra

• Geometry

• Calculus

• Physics

18 + n = 2(3+6)

Choose which value, if any, is a solution to the equation.

• y=2.15

• y=2.95

• y=3.05

• y=3.15

• No solution is given.

Diego has 7 packs of markers. Each pack has markers in it. After Lin gives him 9 more markers, he has a total of 30 markers. In the equation 7x+9=30 , the X refers to.....

Elena walked 20 minutes more than Lin. Jada walked twice as long as Elena. Jada walked for 90 minutes. The equation 2(x+20)=90 describes this situation. What does x represent in this story?

• The number of minutes that Elena walked

• The number of minutes that Jada walked

• The number of minutes that Lin walked

• Neither

n + 7 + n = 21