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adell [148]
3 years ago
7

Explain how to isolate the variable in this equation -2/5x+7=15

Mathematics
1 answer:
SSSSS [86.1K]3 years ago
3 0

Answer:

x = -20

Step-by-step explanation:

Use inverse operations and simplification to isolate the variable in the equation.

-\frac{2}{5}x + 7 = 15\\-7\\\\-\frac{2}{5}x = 8\\

Now divide the equation by (-\frac{2}{5}) remember, dividing a fraction is the same as multiplying by the reciprocal. The reciprocal of a fraction is when one switches the places of the numerator (number on top of a fraction bar), and the denominator (number on the bottom of the fraction bar).

-\frac{2}{5}x = 8\\

÷-\frac{2}{5}

x = 8 * (-\frac{5}{2})

Simplify,

x = 4 *(- 5)\\\\ x= -20

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