Question

substitution method
2x+4y=8
8x+7y=16​

Answer 1

Step-by-step explanation:

Finding the value of y from equation 2x+ 4y = 8;

we get

y = (8-2x)/4;

Now putting this value in equation 8x +7y = 16;

we get

8x + 7(8-2x)/4 = 16;

now solving this

32x +56-14x = 64;

18x = 64-56;

18x = 8;

x = 8/18 = 2/9; Now putting this value in y = (8-2x)/4 so we get the value of y