Solve the following system of equations. enter the y-coordinate of the solution. round your answer to the nearest tenth. 5x+2y=7 -2x+6=9

What is the value of x in the this question ?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

If the perimeter of the garden is 37 ft. the width is x and the length is 15 ft. what is the width of the garden in feet?