Final answer:
To find the value of x in the equation 5x - 7y = 28, substitute (x - 7) for x in the equation and solve for y, then use the values of x and y to find the value of x.
Step-by-step explanation:
To find the value of x in the equation 5x - 7y = 28, we are given that (x - 7) is a solution. Therefore, we can substitute (x - 7) for x in the equation and solve for y. Then, using the values of x and y, we can find the value of x.
First, substitute (x - 7) for x in the equation:
5(x - 7) - 7y = 28
Simplify the equation:
5x - 35 - 7y = 28
Combine like terms:
5x - 7y - 35 = 28
Add 35 to both sides of the equation:
5x - 7y = 63
Now, we have the equation 5x - 7y = 63, which means (x - 7, y) is a solution to this equation.
since we don't have the value of y, we cannot directly find the value of x. However, if you have any additional information or equations related to this problem, please provide them, and I'll be happy to help further.