Answer:
y = 1300 - 100x
Step-by-step explanation:
Zachary purchased a computer for $1300
The first step is to calculate the purchase he paid after 2 months
= 1,300-1,100
= $200
Then the purchase after 1 month is
= $200/2
= $100 per month
The purchase made after 4 months is
= 1,100-900
= $200
The purchase after a month is
= $200/2
= $100 per month
Therefore the equation that models the balance y after x months is
= initial amount of payment plan - amount per month
y= 1,300 - 100x
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Answer:
1. Equation: 
2. Total pay if Henry sells 27 copies:
Step-by-step explanation:
1. The equation of the line in Slope-Intercept form is:

Where "m" is the slope and "b" is the y-intercept.
According to the information given in the exercise, his base salary is $2,100. So you can identify that:

Since he makes an additional of $90 for every copy of he sells, you can identify that:

Therefore, the equation that represents this situation is:

2. If he sells 27 copies, then:

Substituting this value into the equation, you get that his total pay would be:

Answer:
0
Step-by-step explanation:
2x-x+7 = x+3+4
2x-x-x = -7+3+4
2x-2x = -4+4
0 = 0