Question

Solve the following pair of linear equations using substitution method 2. 2 + 3 + 5 = 0 ; 5 − 3 + 9 = 0​

Answer 1

0.2x+0.3y=1.3       (1)

0.4x+0.5y=1.3      .(

2)

Derive the value of y from equation (1)

y=0.31.3−0.2x  (3)

Substitute value of y in equation(3)

0.4x+0.5(0.31.3−0.2x)=2.30.12x+0.5(1.3−0.2x)=0.690.12x+0.65−0.1x=0.690.02x=0.64x=32

Substitute value of x in equation (3)

y=0.31.3−0.2(32)=0.31.3−6.4=−17

So, x=32 and y=-17