Question

Solve the following by subsitution,elimination and cross multiplication method.
8x+5y=9
3x+2y=4

Answer 1

8x+5y=9...... equation 1

3x+5y=4...... equation 2

from 1st equation

x=(9-5y)/8

put the value in 2nd equation

3(9-5y)/8 +2y=4

(27-15y)/8 +2y=4

(27-15y+16y)/8=4

27+y=4×8

y=32-27

y=5

y=5 put the value in 1st equation

8x+5×5=9

8x=9-25

x=-16/8

x=-2