Please i really need this !!! how do you solve the system of equations x-2y=18 , 3x-2y=-10?
#x-2y=18 , 3x-2y=-10#
2 Answers
Explanation:
Basically, you want to rearrange one equation to give you x= or y=, then you substitute one of those into the OTHER equation.
This will make more sense when I do it.
I will rearrange the 3x-2y to give me y=
Now you substitute this 'y' into the other equation so that
Expand and simplify
Use this x value and sub. it into an equation to solve for y
Explanation:
the two simultaneous equations are to be inspected for a minute
and see whether one of the unknown can be removed by taking
difference or addition of the two equations.
see the coefficients of x and y in the two equations.
we find that y has identical coefficient of -2 in the equation
so if we take a difference of the two on the left as well as right
side one will be left with only y in the resulting difference
suppose i subtract the first from the 2nd equation .
then we get
2x = -28
x= -14
If x is known using any one equation to get y
then y = -16.