Question

the raw score on a certain standarized test is determined by subtracting1/4 of the number of incorrect answers

Answer 1

The number of incorrect answers is 8.

What is a linear equation?

linear equation is an algebraic equation of the form y=mx+b. involving only a constant and a first-order (linear) term, where m is the slope and b is the y-intercept. Occasionally, the above is called a "linear equation of two variables," where y and x are the variables.

Let,

number correct of answer = x

number of incorrect answer = y

Given that,

Total number of answer  x+y = 30 ......(1)

Total score = x-$\frac{1}{4}$y = 20  .......(2)

In equation (2) multiply by -1 on both side.

-x+$\frac{1}{4}$y = -20   .......(3)

Now,

Adding both the equation (1) and (3)

x+y-x+$\frac{1}{4}$y = 30-20

$\frac{5}{4} y$ = 10

y = 8

Hence, The number of incorrect answers is 8.

To learn more about linear equation from the given link:

brainly.com/question/2226590

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