3x+2y=8
5x-2y=8
1) Cross out the 2ys and add the rest of the equations together.
2) 8x=16
3) 16/8=2 Therefore, x=2
4) Add 2 into one of the equations (either one)
5)3(2)+ 2y=8
6) 6+2y= 8
7) Subtractionnnnn 8-6=2
8) 2y=2
9) 2/2= 1
10) y=1 x=2 (2,1)
Answer:
$19.53
Step-by-step explanation:
20/100 × 15.5 = $3.1 → tip cost
Cost +tip = 15.50 + 3.1 = $18.60
Now , sales tax = 6%
6/100 × 15.5 =$ .93
Total amount (tax+lunch+tip) = 18.60+.93
= $19.53
First add like terms in this case 1+7=8. Then then divide. 2x/8= 4. X=4
y = -19
I started by adding 18 to both sides(inverse operation) then dividing by -2 to isolate the variable. What you do to one side must be done to the other