Question

Solve, 0.4 + 0.3 = 1.7; 0.7 − 0.2 = 0.8

Linear equations in two variables​

Answer 1

Answer:

x=2,y=3

Step-by-step explanation:

0.4x+0.3y=1.7,  0.7x-0.2y=0.8

multiply both by 10 to get 4x+3y=17--- 1

and 7x-2y=8---2

so,from 2, x=8+2y/7

substitute value of y in 1 to get

4(8+2y/7)+3y=17

32+8y/7+3y=17

32+8y+21y/7=17

32+29y=17.7

29y=119-32

29y=87

y=3

substitute value of y in eq2 to get

7x-2(3)=8

7x-6=8

7x=8+6

x=2