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Luis and Roberto are donating some of their baseball cards to the library. Luis started with 50 cards and gave away X number of them. Roberto started with 80 cards and gave away 3 times as many as Luis had given away. If they both now have the same number of baseball cards, how many baseball cards did Roberto give away?

A - 15
B - 35
C - 45
D - 65

Respuesta :

Answer:

50-x = 80-3x

50 = 80-2x

-30 = -2x

x = 15

3x = 45

The answer is C

Roberto started with 80 cards and gave 3 times as many as Luis had given which will be 45.

Luis started with 50 cards and gave away x number of them.

Roberto started with 80 cards and gave away 3x number of them.

What is a linear equation?

The linear equation is an equation that is expressed in the general form as ax + b = 0. The highest power of the variable is always 1.

Solving a linear equation means finding the value for the variable that satisfied the given equation.

So, The equation formed

50 - x = 80 - 3x

2x = 30

x = 15

Therefore, Roberto gave 3 times as many as Luis had given which will be 45.

Learn more about linear equations here:

https://brainly.com/question/2263981

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