Question

The solution of 8x+5y=9and3x+2y=4

Answer 1

8x+5y=9
3x+2y=4
Multiplying equation 1 by 2
16x+10y=18
Multiplying question 2 by 5
15x+10y=90

Subtracting both the equation we get,
1x=-72
x=-72/1

Substituting x=-72/1 in equation 3 we get,
16+72/1+10y=18
16+72/1+10y=18
88/1+10y=18
10y=18-88
10y=-70
y=-70/10
y=-10