Linear Algebra Review

Find my ex

1

Solve: x+12=7

x=-5

(-100)

2

Solve: -9+x=12

x=21

(+200)

3

Solve: 40=-8x

x=-5

(-400)

4

Solve: 19-4x=17

x=0.5

(-100)

5

Solve: 3x-1=7x+2

x=-0.75

(-200)

It's all downhill from here

1

What is the slope in this equation:

y = -5/2x + 2

-5/2

(+300)

2

What is the y intercept in this equation:

y = -2x + 3

3

(+300)

3

Find The Slope: (-2,-2),(4,-1)

1/6

(+300)

4

Find The Slope: (-8,-10) and (-7,0)

 10

(+300)

5

Find The Slope: (4,15) and (10,4)

-11/6

(-500)

Word Nerd

1

This vocabulary term refers to the steepness of a line

slope OR gradient

(-500)

2

This vocabulary term refers to the initial value, or starting point, of a linear equation

y-intercept

(+300)

3

This term refers to an equation whose graph makes a straight line

linear equation

(+300)

4

When an expression includes an = , it is called this.

An Equation.

(+200)

5

This vocabulary term refers to a numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g. 4 in 4x). 

Coefficient

(+500)

Substitute Teacher

1

Find the solution to the Simultaneous Equations:

y = x + 3

y = 2x - 2

(5,8)

(-200)

2

Determine if the following lines are parallel, perpendicular or neither:

y = -5x - 4

5y = 2x + 2 

Neither.

(m₁ = -5, m₂ = 2/5 so not parallel, m₁ x m₂ = -2, so not perpendicular)

(+200)

3

Find a solution for the following simultaneous equations:

y = x + 5

3x + y = 13

(x , y) = (2, 7)

(+500)

4

Solve the pair of simultaneous equations:

x + y = 5

2x - y = 4

(x , y) = (3 , 2)

(+500)

5

Solve the following pair of simultaneous equations:

3x + 2y = 5

2x + 3y = 5

(x , y) = (1, 1)

(-400)

I got 99 Problems

1

Find an expression for the area of a floor of a rectangular room with the following side lengths:

x + 3

2x

2x² + 6x

(+500)

2

Write an equation for the following and solve for x:

5 less than x when doubled is -15

2(x-5) = -15

so x = -2.5

(-500)

3

Substitute the following values to find a:

v = u + at where v = 6, u = 2, t = 4

a = 1

(-400)

4

The perimeter of a square is 68cm. Determine its side length.

Length = 17cm

(-400)

5

The capacity of a petrol tank is 80L. If it initially contains 5L and a petrol pump fills it at 3L per 10 seconds, how long it will take to fill the tank to 32L.

1 minute 30 seconds OR 90 seconds

(+300)