Y=–3x +  6y=9 what is the solution to the system of equations? (–21, 9) (9,  –21) (–1, 9) (9,  –1)

ANSWER

The solution is

EXPLANATION

We want to solve the simultaneous equations

and

.

We substitute equation (2) in to equation (1), to obtain

This has now become a linear equation in a single variable .

We solve for x  by grouping like terms.

We divide through by negative 3 to get;

.

Hence, the solution is

it is b)

hope this : )

step-by-step explanation:

i belive those are the ones that are under 90 degreese.