y=2x+12
7x+y=24 (as there is y in both equations you can assume that the equations are equal to each other, so substitute)
7x+2x+12=30 (solve)
9x=18
x=2 (substitute into the first equation to solve for y)
y=(2x2)+12
y=16
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umm do the equation :L
If you are trying to solve a linear equation and facing difficulty in doing so then try to understand that the variable which u have taken is depending on what factor..and equate it with the constant..by doing this you will be able to solve the equation.
by elimination,substitution or through the matrix method.
You cannot solve one linear equation with two unknown variables.
You cannot solve one linear equation with two variables.