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solving system of linear equations by substitution
y=2x
x+y=21
Replace y = 2x into the second equation.
we get:
x + 2x = 21
we get
3x = 21
divide both sides of the equation by 3
3x/3 …
ALGEBRA II
FIND THE VALUE OF K SO THAT THE TWO GIVEN LINES WILL BE PARALLEL.
3X-KY=7
2X+5Y=-1
First, put the two equations in standard form
3X - KY = 7
…
cost of cd
Andrew had $93.00. With this money, he could buy 3 CDs and 4 books. However, he bought only 2 CDs and 3 books and had $27.00 left. What was the cost …
age problem
The sum of Mira and Shaheena is 40 years. After 10 years Mia will be twice as old as Shaheena. What is Mia's age. What is Shaheena's age?
Solution …
Length and Width
The perimeter of a rectangle is 138 inches. The length exceeds the width by 65 inches. Find the length and width.
P = 2l + 2w
l = w + 65
138 = …
college student
Alvin's age is three times Elga's age. The sum of their ages is " 40 ". What is Elga's age?
Let x be Alvin's age
Let y be Elga's age
x + y = …
rectangle word problem
the length of a rectangle is 5 more than the width and the area is 24. Find the length and the width.
The formula of the area of a rectangle is
…
Story word Problem: linear equation
A salesperson earns a $200 per week in base pay plus one-twentieth of his/her dollar sales volume. Find the salesperson’s dollar sales volume if he/she …
find each side of a triangle Not rated yet
The perimeter of a triangle is 58 centimeters. The longest side is 2 centimeters less than the sum of the other two sides. Twice the shortest is 12 centimeters …
Now go to the lessons below to learn how to solve a system of linear equations. I have also included a system of linear equations solver.
System of linear equations solver
Jan 08, 16 02:23 PM
A scientist wants to dilute a 60% acid solution by adding some 20% solution. If she starts with 80 ml of the 60% solution, how many milliliters of the