text: what is the solution to the system containing these equations (2 problems)? problem 1: x+y=-8 -3x+2y=9  answers:  -5,-3 0,0 2,6 no solution    problem 2: y=x+5 x+y=9  answers:  -5,0 2,7 4,5 no solution these two problems are examples of simultaneous linear equations in two unknowns.  solution for prob. 1: x + y = -8 ---> eq.1 -3x + 2y = 9 ---> eq. 2  solve for x in eq.1  x = -8 - y ---> eq. 3   substiture eq. 3 in eq. 2 -3(-8 - y) + 2y = 9 24 + 3y + 2y = 9 24 + 5y = 9 solve for y 5y = 9 - 24 5y = -15 then y = -3 substitute this back in eq. 3 to solve for x: x = -8 - (-3)          x = -8 + 3          x = - 5 therefore the missing values for x and y are -5 and -3 respectively  solution for problem # 2: y = x + 5 eq. 1 x + y = 9 eq. 2 subtitute eq. 1 in eq. 2 x + (x+5) = 9 2x + 5 = 9 2x = 9 -5 2x = 4 x = 2 substitute this back in eq. 1 y = 2 + 5 y = 7 the values for x and y are 2 and 7 respectively  hope this helps :-)