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Anon25 [30]
3 years ago
10

If y=5x-3(3x+7), what is the value of x when y=-18?

Mathematics
1 answer:
mina [271]3 years ago
3 0

Answer:

x = -3/4

Step-by-step explanation:

Simplify the equation.

5x - 3(3x + 7) = y

5x - 3*3x + 7 *(-3) = y   {Distributive rule}

         5x - 9x - 21 = y  

Combine like terms

           -4x - 21 = y

Now, substitute the value of y = -18

-4x - 21 = -18

Add 21 to both sides

-4x  = -18 + 21

 -4x = 3

Divide both sides by -4

x = -3/4

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