The short answer is to solve one equation for one variable, then swap that variable in a different equation.
Example:
2x + 2y = 6
y-x = 1
Step 1: solve either equation for a variable: (#2) y = x+1
Step 2: substitute for your solved variable (I can substitute x+1 for y)
(#1) 2x + 2(x+1) = 6
2x + 2x + 2 = 6
4x + 2 = 6
4x = 4
x = 1
now use x=1 to solve for y in either original equation
I'm pretty sure it's a Coma but you might want to try to finish the other words to see if it fits because I'm not a huge space person :)
Hey!
We can check which would give us a better price by calculating each final price after the discount has been added:
Option A):
$899 - $150 = $749
Option A) will cost $749.
Option B)
$899 × 0.25 = $224.75
$899 - $224.75 = $674.25
Option B) will cost $674.25
Option C)
$899 - $75 = $824
$824 × 0.15 = $123.6
$824 - $123.6 = $700.4
Option C) will cost $700.4
Option D)
$899 - $50 = $849
$849 × 0.20 = $169.8
$849 - $169.8 = 679.2
Option D) will cost $679.2
So, Coupon B) $674.25 is the best deal for the computer.
1/f = 1/a+1/b
RHS= b+a/ab (taking LCM)
Cross-multiplication: 1/f=a+b/ab
=>ab=(a+b)f
=>f=ab/a+b
Answer:
The slope is -3
Step-by-step explanation: