4x plus 3y equals -15 2x-3y equals -3?

Answer 1

4x + 3y = -15

2x - 3y = -3

Simultaneous Equations.

Since the coefficient of 'y' is '3' , but of opposite sign, we can add the eq'ns. This will eliminate 'y'

Hence

6x = -18

Divide both sides by '6'

Hence

x = -3

We now substitute this value of 'x' into either eq'n to find 'y' /

Hence

2(-3) -3y = -3

-6 - 3y = -3

-3y = 3

y = -1

Hencethe answer in ( x,y) form is ( -3, -1).

Answer 2

4x+3y=-15

2x-3y=-3

Take second equation and multiply the whole with 2 so that when subtracting the two equations we can cancel out x. so it becomes 4x-6y=-6

4x +3y = -15

( - ) 4x -6y = -6

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0x + (+3-(-6))y = -15 - (-6))

9y = -9 .. or y=-1

So take any one equation and find x by substituting y value

2x - 3(-1)= -3

2x +3 = -3

2x = -6

x = -3

So x = -3, y = -1