Question 82047
10x+2y=7--------(1)

    y=-5x+3-------(2)

plugging the value of y from equation(2) into equation (1) ,we have

10x+2(-5x+3) =7

10x -10x+6 = 7

since we have +10x and -10x in the above equation they get cancelled 

Hence there is no solution 

Hence  the system is inconsistent