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11
Without a second independent equation, it's not a 'system' yet.
If you mean: y = 2x-10 then it is 2x-y-10 = 0
If you mean: y = 2x+5 then it is a straight line equation.
y=2x+4 is in slope intercept form
6
The slope of y = 2x - 4 is 2. (y = mx + b, where m is the slope, in this case 2.)
y2x - just double the coordinate of y to get x. xy12 - i have no idea
(4,1)
If you mean: y = x-2 and y = 2x-8 then it works out that x = 6 and y = 4
If you mean: y = 2x+1 then the gradient is 2 and the y intercept is 1
5
2x + 2y = 14 eqn 12x - y = 5 eqn 2Solve for X and Y.Simplify eqn 2 to solve for y2x - y = 5subtract sx from both sides-y = 5 - 2xmultiple both sides by -1y = 2x - 5substitute 2x - 5 into eqn 1 for y2x + 2y = 142x + 2(2x -5) = 142x + 4x - 10 = 146x - 10 = 14add 10 to both sides6x = 24divide both sides by 10x= 4Substitute x = 4 into eqn 2y = 2(4) - 5y = 8 - 5y = 3X = 4 and y = 3
7
5
No because it's not a simultaneous equation but some kind of algebraic expression