What is the solution (x,y) of 5x+1y=11 and 1x-1y=4?

A. (5 / 2,-3 / 2)

Step 1: Identify the concept: linear equations by determinants. Step 2: By Cramer's rule, a non-zero determinant gives a unique solution. Calculation gives x=5/2, y=-3/2. Step 3: Exam tip: A non-zero coefficient determinant means a unique solution.

Step 1: अवधारणा linear equations by determinants है। Step 2: Cramer's rule से determinant non-zero होने पर unique solution मिलता है। Calculation से x=5/2, y=-3/2। Step 3: याद रखें: Coefficient determinant zero नहीं हो तो solution unique होता है।