Solve the system using elimination.
3x + 3y = -9
3х - Зу = 21

value of x = 2

y = -5

Step-by-step explanation:

here's the solution: -

the given equations are ,

=》3x + 3y = -9

=》3x - 3y = 21

so, let's add the equations,

=》3x + 3y + 3x - 3y = -9 + 21

=》6x = 12

=》x = 2

now, plugging the value x = 2, in equation 1 : -

=》3x + 3y = -9

=》(3 × 2) + 3y = -9

=》6 + 3y = -9

=》3y = -15

=》y = -5

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step-by-step explanation:

i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.

i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).

in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.

then the standard form of the equation is finding an expression of y in function of x

y-1=1/4*(x-12)

y=x/4-3+1

y=x/4-2

hope that .

do you confirm there was a mistake in the question?