Y=1/2x-3 and 9x-2y=-74 substitution

Find two numbers if their sum is 91 and the ratio is 6: 7?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Which of these statements is correct? the system of linear equations 6x - 5y = 8 and 12x - 10y = 16 has no solution. the system of linear equations 7x + 2y = 6 and 14x + 4y = 16 has an infinite number of solutions. the system of linear equations 8x - 3y = 10 and 16x - 6y = 22 has no solution. the system of linear equations 9x + 6y = 14 and 18x + 12y = 26 has an infinite number of solutions.