5x+7y=25
5x-2y=-65
subtract both of the equations
5x-5x=0
7y--2y= 7y+2y=9y
25--65=25+65=90
0+9y=90
9y=90
divide both sides by 9 to get y by itself
9y/9=90/9
cross out 9 and 9 which becomes 1*1*y=y
90/9=10
y=10
find x by using the substitution method
5x+7y=25
5x+7(10)=25
5x+70=25
move +70 to the other side
sign changes from +70 to -70
5x+70-70=25-70
5x=-45
divide both sides by 5 to get x by itself
5x/5=-45/5
cross out 5 and 5 then becomes 1*1*x=x
-45/5=-9
x=-9
answer:
(-9,10)
Answer:
$50,581.9
Step-by-step explanation:
(2x-5)(3x-1)=0
2x-5 = 0 or 3x-1= 0
2x = 5 3x = 1
x = 5/2 x = 1/3
Answer: x=5/2; x=1/3
Answer:
679 mm
Step-by-step explanation:
1 cm=10 mm
so 67=670
Total amount paid by Rita is $98.79
Step-by-step explanation:
- Step 1: Given sales tax = 11% and cost of jeans = $89
- Step 2: Calculate amount of sales tax = 11% of 89 = 11/100 × 89 = $9.79
- Step 3: Calculate the total amount
Total Amount = 89 + 9.79 = $98.79
