Question

4. The equation of a function is y=25 - 3x. Find the value of x when i(y=34) ii(y=-5)

Answer 1

Answer:

• If y= 34 in y = 25 - 3x then x = -3
• If y= -5 in y = 25 - 3x then x = 10

Step-by-step explanation:

Given y = 25 - 3x

i) If y= 34

then y = 25 - 3x

34 = 25 - 3x

3x = 25 - 34

3x = - 9

x = -9/3

x = -3

ii) If y = - 5

then y = 25 - 3x

-5 = 25 - 3x

3x = 25 + 5

3x = 30

x = 30/3

x = 10

Answer 2

$\boxed{\mathrm{Answer - }}$

$when \: \: y \: = 34 \\ = > 34 = 25 - 3x \\ = > -3x = 34 - 25 \\ = > -3x = 9 \\ x = \frac{9}{-3} = -3 \\ \therefore \: x = -3$

$when \: \: y = - 5 \\ = > ( - 5) = 25 - 3x \\ = > - 3x = ( - 25) + ( - 5) \\ = > - 3x = - 30 \\ = > x = \frac{( - 30)}{( - 3)} = 10 \\ \therefore \: x = 10$