5x+y-8=0 and -3y+7x+2=0 solve each system of equations using substitution method

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Can someone me and plz do the problem

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)