Question

find the unknown variable

Answer 1

Answer:

7y-2=3x , 3x-7y=-2 1st equation

9y=4x+1, 4x-9y=-1 2nd equation

multiply 1st equation by 4 and 2nd equation by 3 and then subtract-28y+27y=8+3=11

y=11

Put this value of y in any of the above equations, you will get the value of x, x=25

Q10: 7x-15=4x+15

3x=30, x=10

Q9: 2x+33+3x=180

5x=180-33=147

x=147/5

y+3x=180

y=180-(3×147/5)