Answer:
The value of a - b + c + d = -4
Explanation:
* Lets explain the linear equation
- The linear equation is the equation that represented graphically
by a line
- The general form of its equation is ax + by = c
- The slope of the line is -a/b and the y-intercept of the line is c/a,
where a is the coefficient of x , b is the coefficient of y and c is the
numerical term
∵ We have two linear equation in the problem
∴ Their general form is ax + by = e , cx + dy = f
∵ The equation are 2x + 8y = 7 and 4x - 2y = 9
- By comparing the two equations with their general forms
∴ a = 2 , b = 8 , c = 4 , d = -2
- Now we can find the value of a - b + c + d
∵ a = 2 , b = 8 , c = 4 , d = -2
∴ a - b + c + d = 2 - 8 + 4 + (-2) = 2 - 8 + 4 - 2 = -4
* The value of a - b + c + d = -4