Question

Solve for x and y by elimination method of equations 5x - 4y + 8 =0 and 7 x + 6 Y - 9 =0

Answer 1

Let suppose 5x - 4y + 8 =0 are equation frist,and 7 x + 6 Y - 9 =0 are equation second
now x factor 7 multiply in equation frist and x factor 5 multiply in second equation
than we get equation
35x-28y=-56
35x+30y=45
now we minus equation second from equation frist
than we get
-58y=-101
y=101/58
put this in equation frist
5x-4*101/58=-8
5x-404/58=-8
5x=-8+404/58
5x=(-464+404)/58
5x=-60/58
x=-12/58
x=-6/29