I think u mean what is 8y if y=10? that would make the answer 80. 8x10= 80. If there is a variable next to a # then you multiply both.
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y = 4x - 8 y = 2x + 10 The substitution means to: Find the intersection point of their graphs, which is the common solution of this linear system of equations: 4x - 8 = 2x + 10 2x = 18 x = 9 y = 4(9) - 8 = 36 - 8 = 28 or y = 2(9) + 10 = 28 Thus the solution is (9, 28)
8 + 5y = 18 Therefore, 5y = 10 y = 10/5 y = 2
To answer the question you need to know what Y=.
If: y = x -2 and 7y -4x = 10 Then: x = 8 and y = 6
Suppose the numbers are x and y and that x < y Then y = 2x + 8 and x + y = 3y - 10 The second implies that x = 2y - 10 which, by the first gives x = 2(2x + 8) - 10 = 4x + 16 - 10 So -3x = 6 so that x = -2 and then y = 2*(-2)+8 = 4 So the two numbers are -2 and 4.