Multiply 3 with 7.
3 * 7 = 21
The value of the gift card changed by -$21 dollars.
Answer:
y = -x - 4
General Formulas and Concepts:
<u>Pre-Algebra</u>
<u>Algebra I</u>
Slope-Intercept Form: y = mx + b
- m - slope
- b - y-intercept
Step-by-step explanation:
<u>Step 1: Define</u>
x + y = -4
<u>Step 2: Rewrite</u>
<em>Find slope-intercept form</em>
- Subtract <em>x</em> on both sides: y = -x - 4
Answer:

Step-by-step explanation:
Represent Alice with A, her friend with F and you with Y.
From the question, we have:

--- Twice as much Alice means 2 times Alice's earnings
--- 2 less than her friend
Required
Determine the total amount

Substitute
for A in


Substitute
for F in 

The total amount is calculated by adding the earnings of Alice, her friend and you



<em>Hence, the total earnings is 5d - 2</em>