# Grade 9 2nd Quarter Pre-Test

## Quiz by Daren Perez

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- Q1
Which is an example of direct variation?

$xy=2$

$y=2x$

$y=\backslash frac\{2\}\{x\}$

$x=\backslash frac\{1\}\{2y\}$

30sM9AL-IIa-1 - Q2
Which is an example of inverse variation?

$y=4x$

$x=-4y$

$x=\backslash frac\{y\}\{4\}$

$y=\backslash frac\{4\}\{x\}$

30sM9AL-IIa-1 - Q3
The length 𝑙 of a rectangular field varies inversely as its width 𝑤 is written as ____.

$w=\backslash frac\{k\}\{l\}$

$l=\backslash frac\{k\}\{w\}$

$l=kw$

$w=kl$

30sM9AL-IIa-1 - Q4
If 𝑦 varies inversely as 𝑥 and 𝑦 = 12 when 𝑥 = 4, find 𝑦 when 𝑥 = 3.

15

17

18

16

30sM9AL-IIb-c-1 - Q5
What mathematical equation describes the graph below?

𝑦 varies inversely as 𝑥, where 2 is the constant of variation

𝑦 varies directly as 𝑥, where 2 is the constant of variation

𝑦 varies inversely as 𝑥, where 12 is the constant of variation

𝑦 varies directly as 𝑥, where 12 is the constant of variation

30sM9AL-IIa-b-1 - Q6
Which equation represents “y varies directly as x and z”?

$y=xz$

$y=\backslash frac\{kx\}\{z\}$

$y=kxz$

$y=\backslash frac\{kz\}\{x\}$

30sM9AL-IIa-b-1 - Q730sM9AL-IIa-b-1
- Q8
It is defined as the variation where a quantity depends on two or more other quantities, whereas one quantity varies directly while the other quantity varies inversely.

Direct

Combined

Joint

Inverse

30sM9AL-IIa-1 - Q9
“The Interest earned by a savings account of Mr. Viray is jointly proportional to the Time and its Principal amount. After one quarter (3months), the interest for a principal amount of Php 6,000 is Php 120.” How much interest is earned within 5 months if the principal amount is Php 7,500?

Php 200

Php 300

Php 250

Php 350

30sM9AL-IIb-c-1 - Q10
In the expression 3𝑥², 2 is called _____.

Numerical Coefficient

Exponent

Literal Coefficient

Constant term

30sM9AL-IId-1 - Q11
Which of the following is TRUE?

$\backslash frac\{x^\{-2\}\}\{x^5\}=x^3$

$x^6\backslash cdot\; x^3=x^9$

$a^0b^2=ab^0$

$\backslash left(b^\{-5\}\backslash right)^0=b^\{-5\}$

30sM9AL-IId-1 - Q1230sM9AL-IId-1
- Q1330sM9AL-IId-1
- Q1430sM9AL-IIe-1
- Q1530sM9AL-IIf-1