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3 years ago

If f(x) = 8 - 4x, find the value of x when f(x) = -12.

Mathematics

2 answers:

DiKsa [7]3 years ago

7 0

Answer:

x=5

Step-by-step explanation:

-12=8-4x

-20=-4x

5=x

zzz [600]3 years ago

6 0

^^^ she got the answer

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Please help me 33/2 + 3y/5 = 7y/10 + 15

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We are given with an equation in variable y and we need to solve for y . So , now let's start !!!

We are given with ;

${:\implies \quad \sf \dfrac{33}{2}+\dfrac{3y}{5}=\dfrac{7y}{10}+15}$

Take LCM on both sides :

${:\implies \quad \sf \dfrac{165+6y}{10}=\dfrac{7y+150}{10}}$

Multiplying both sides by 10 ;

${:\implies \quad \sf \cancel{10}\times \dfrac{165+6y}{\cancel{10}}=\cancel{10}\times \dfrac{7y+150}{\cancel{10}}}$

${:\implies \quad \sf 165+6y=7y+150}$

Can be further written as ;

${:\implies \quad \sf 7y+150=165+6y}$

Transposing 6y to LHS and 150 to RHS

${:\implies \quad \sf 7y-6y=165-150}$

${:\implies \quad \bf \therefore \quad \underline{\underline{y=15}}}$

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