For the following system, if you isolated x in the first equation to use the substitution method, what expression would you substitute into the equation? -x-2y=-4 3x+y=12

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

Could someone with number 1 and 2

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.