# Which Expression Gives the Y-Coordinate of the Solution of the System?

Which Expression Gives the Y-Coordinate of the Solution of the System?

In mathematics, a system of equations refers to a collection of equations that are solved simultaneously. These systems can be solved using various methods, such as substitution, elimination, or graphing. When solving a system of equations, it is often necessary to find the coordinates of the solution, which include both the x and y values. This article will focus on determining the expression that gives the y-coordinate of the solution of the system.

To understand the expression that gives the y-coordinate, let’s start by considering a simple system of equations:

Equation 1: 2x + 3y = 7
Equation 2: 4x – 5y = 1

To find the y-coordinate of the solution, we need to isolate the variable y in one of the equations. Let’s choose Equation 1 and solve for y:

2x + 3y = 7
3y = 7 – 2x
y = (7 – 2x) / 3

Now we have an expression for y in terms of x. This expression can be used to find the y-coordinate for any given x-coordinate in the solution of the system.

To illustrate this further, let’s consider a specific example. Suppose we want to find the y-coordinate when x equals 2. Plugging x = 2 into the expression we derived earlier:

y = (7 – 2(2)) / 3
y = (7 – 4) / 3
y = 3 / 3
y = 1

Therefore, when x = 2, the y-coordinate of the solution is 1.

It is important to note that this expression can vary depending on the system of equations being solved. In some cases, it may be necessary to use different methods or solve for a different variable to find the y-coordinate. For example, if the system is given in terms of y and z, the expression for the y-coordinate would be different.

FAQs:

Q: Can the expression for the y-coordinate be negative?
A: Yes, the y-coordinate can be negative depending on the values of x and the coefficients in the equations. The sign of the y-coordinate is determined by the specific values in the solution.

Q: What if there are more than two equations in the system?
A: If there are more than two equations, the process to find the expression for the y-coordinate remains the same. Solve one of the equations for y in terms of the other variables and then substitute the values of the other variables to find the y-coordinate.

Q: Is it always possible to find an expression for the y-coordinate?
A: Not necessarily. In some cases, the system of equations may be inconsistent or have no solution. In such scenarios, it is not possible to find a specific expression for the y-coordinate.

Q: Can the expression for the y-coordinate involve fractions?
A: Yes, the expression for the y-coordinate can involve fractions. The coefficients in the equations and the values of x can lead to fractional expressions for the y-coordinate.

Q: How can I verify the accuracy of the expression for the y-coordinate?
A: To verify the accuracy, substitute the derived expression for y into all the equations of the system and check if the resulting equations are satisfied. If they are, the expression is correct, but if not, there might be an error in the calculations.

In conclusion, finding the expression for the y-coordinate of the solution of a system of equations involves isolating the variable y in one of the equations. This expression allows us to determine the y-coordinate for any given x-coordinate in the solution. However, it is important to note that the expression can vary depending on the specific system of equations being solved.