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svp [43]
4 years ago
12

How you do number 11 ? Please do explain

English
2 answers:
sineoko [7]4 years ago
8 0
The person just substituted x in f(x) and got the answers (-3,3,9,15,21).And the question is to find f(-2).The answer is 3
valkas [14]4 years ago
5 0
Take a look:

f(x) = ax+b

Replacing the table values:

→ x = 0 | f(x) = y = 9
f(x) = ax+b
y = ax+b
9 = a·(0)+b
b = 9

Let's take another value for x:

f(x) = ax+9
f(2) = a(2)+9
15 = 2a+9
2a = 6
a = 3

So, the function is:

f(x) = 3x+9

f(-2) → x = -2

f(-2) = 3(-2)+9
f(-2) = -6+9
f(-2) = 3
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