Arthur D. answered • 09/07/14
Tutor
4.9
(274)
Forty Year Educator: Classroom, Summer School, Substitute, Tutor
4x-7y=-60
-4x-5y=-36
add the two equations
0-12y=-96
-12y=-96
y=-96/-12
y=8
substitute 8 for y in either equation
4x-7(8)=-60
4x-56=-60
4x=-60+56
4x=-4
x=-4/4
x=-1
(-1,8) is the solution
