Question

A local Best Buy store sold 144 TVs last week. If five times as many LCD models sold as compared to plasma models, how many plasma tv we’re sold

Answer 1

Plasma models = 24

Explanation:

Set the system of equation:

Let LCD models = x, and Plasma = y

x + y = 144

x = 5y

Plug in 5y for x in the first equation.

(5y) + y = 144

Simplify

6y = 144

Isolate the variable, y. Divide 6 from both sides

(6y)/6 = (144)/6

y = 24

Plug in 24 for one of the equations.

x + y = 144

x + (24) = 144

x + 24 (-24) = 144 (-24)

x = 144 - 24

x = 120

Plasma models = 24 ; LCD models = 120

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