Solve the system of linear equations by substitution. −5x+y=−7
−3x−2y=−12

Please help I'm having panic attacks about failing this test and failing the class this is my last test and I have a C please help

How do i do this? i don’t understand

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Formulate alisha has a number in mind. if she adds three to her number the result is less than five. use this information to write and solve an inequality about alisha's number. then graph the solution set.