Which points in the image of rectangles ABCD under the transformation?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120