Q:

Solve the system of linear equations. −8x+5y=269x−3y=−3

Accepted Solution

A:
Answer: x = 3 and y = 10Step-by-step explanation:-8x + 5y = 26     .................. equation 19x - 3y = -3          ................ equation 2Solving the system of linear equations by elimination method.The means we have to make the coefficient of one of the variable the same in order to eliminate the variable first.Let us eliminate the variable y first , this means we will multiply equation 1 by 3 and multiply equation 2 by 5. Doing this , we have-24x + 15y = 78      ............. equation 345x - 15y = -15     ................ equation 4Now that we have the same coefficient , we have to check their signs , if the have the same signs , we will subtract , that is , if both are having positive signs , we will subtract , if both have negative signs , we will also subtract but if their signs differ we will add. Following this rule and considering the equations above , the coefficients of y have different signs , so we will add equation 3 and equation 4 , so we have:21x = 63x = 63/21x = 3Substitute x = 3 into equation 1 or equation 2 to get the value of y , using equation 2 , we have9x - 3y = -39(3) - 3y = -327 - 3y = -327+3 = 3y30 = 3y30/3 = yTherefore y = 10Therefore : x = 3 and y = 10