11 General Unit 1 Warm Up

Identify the gradient and y-intercept of the equation: y = -x + 4

• m = 4, c = -1

• m = -1, c = 4

• m = -1x, c = 4

• m = 1, c = -4

Is the gradient of this line positive, negative, zero or undefined?

• positve

• undefined

• negative

• zero

What is the x-intercept and y-intercept of this graph?

• x-int = 1, y-int = 1/2

• x-int = 1, y-int = 2

• x-int = 1, y-int = -2

• x-int = 1/2, y-int = 1

What is the gradient of this graph?

• m = -1/2

• m = -2

• m = 2

• m = 1/2

Graph the equation x - 2y = 4 by finding the x-int and y-int

Answer explanation

y-int, let x = 0

0 - 2y = 4

y = 4/-2

y = -2

y-int occurs at (0, -2)

x-int, let y = 0

x - 2 x 0 = 4

x = 4

x-int, occurs at (4, 0)

Use Pythagoras' theorem to solve for x

• x = 12

• x = 10

• x = 7

• x = 1000

Mr. Warren invests his life savings of $300 for 2 years at 4% per year simple interest. How much interest does he make?

• somehow he makes $1 million

• $32

• $24

• $6

You are building a house and you're up to designing your bedroom. You know the area of your bedroom needs to be 15m^2 and the width has to be 3m long. What does the length need to be?

• 5m

• 3m

• 8m

• 12m

You're at an old lady's garage sale and get a 10% discount for buying two items. If the two items cost $20 and $30 how much will you pay after the discount?

• $5

• $40

• $45

• I don't pay. I sweet talk the old lady into giving them to me for free.

What is the value of x?

• 3

• 13

• 9

• 12