Select the ordered pair from the choices below that is a solution to the following system of equations: 3x = y + 18 y + 7 = -30x (7, 3) (-2, 12) (1/3, -17) (-4, 2)

Question

Select the ordered pair from the choices below that is a solution to the following system of equations: 3x = y + 18            y + 7 = -30x (7, 3) (-2, 12) (1/3, -17) (-4, 2)

anonymous · Answer

You can solve this system of equations with substitution or subtraction. Do you have a preference of method?

anonymous · Answer

no

anonymous · Answer

I would recommend substitution. It works well for all systems of equations.
Start by picking one equation and solve for one variable.
My suggestion is to solve either equation for y since that will avoid fractions.

anonymous · Answer

3x = y + 18
y + 7 = -30x i.e. y= -30x-7
i.e. 3x= -30x-7+18
33x=11
x=11/33=1/3
y=-10-7=-17
thus (x,y)=(1/3, -17) is the correct ordered pair

anonymous · Answer

thank you