Question

3x-4y=10, 4x+3y=5 by substitution method

Answer 1

Answer:

x=-34/15 y=-21/5

Step-by-step explanation:

3x=10+4y

implies x=(10+4y)/3. (eq.1)

putting value of x in 4x+3y=5

4(10+4y/3)+3y=5

40+(16y/3)+3y=5

(16y/3)+3y=5-40

taking lcm

(16y+9y)/3=-35

25y=-35×3

y=-35×3/25

y=-21/5

putting value of y in equ.1:-

x=[10+4×(-21/5)]/3

x=( 10-84/5)/3

x=50-84/15

x=-34/15