Question

0.4 x +0.3 y =1.7
0.7x-0.2y=0.8
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Answer 1

Answer:

a= 0.4 b = 0.3 and c = -1.7 second one a = 0.7 b = 0.2 and c = -0.8

Step-by-step explanation:

Answer 2

Step-by-step explanation:

firstly we are rearrange this equation and then solve it. 4*10/10 + 3*10/10 = 17*10/10........( i) equation. then . 7*10/10 - 2 *10/10=8*10/10.....(ii) equation. our equation is. 4x + 3y = 17. ...... ( i) eqa.

7x- 2y= 8...........(ii) eqa.

by substituting method.

4x+3y=17...... ( i) equation

4x= 17- 3y

X= 17-3y/ 4....... ( iii) eqa

put this equation in ( ii) equation

7x-2y =8

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

119-21y/4-2y = 8

119-21y -8y =32

119-29y= 32

-29y= 32-119

-29y = -87

y= 3

and x=17-3y/4=17-3(3)/4=17-9/4=8/4=2

X=2 and y=3