Graph the line y=-2/5x-4

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50