An electrician has $120 to spend on interior light fixtures. The wholesale price for a 13-watt low-energy lamp is $4. The price for a high-energy lamp is $5. 1) Write the algebraic expression for how much the electrician spends for a units of the low - energy of the low-energy lamp and b units of the high-energy lamp. 2) Write an equation that relates your answer to Exercise 1 to the amount of money the electrician has to spend.

X = low-energy lamp

y = high-energy lamp

1) 4x + 5y

2) 120 = 4x + 5y

Ok, are you ready? Here we go:

First we know that he has 120 dollars, so the first part of the equation is 120 = ?

it equals something, we dont know, so lets find out.

low energy lamp: 13 dollars per unit

High Energy Lamp: 14 dollars per unit

So, 13a (a stands for "a units") and 14b (b stands for "b units) are the respective equation for the given values, that's question 1

Question 2, we connect the 120 values and the 2 equation we made, so 13a + 14b = 120 dollars