If we have the substitution for y, replace the y in the equation with -3 -3x-5(-3)=6 Multiply the -5 with the -3, and when you multiply a negative number with a negative it turns into a positive -3x+15=6 Bring the 15 over to the other side of the equation to get the x number by itself like this —-> -3x=6-15 and when you cross over a number to the other side of the equation it’s positive or negative sign changes into the opposite Now subtract -3x=-9 Divide -3x = -9 —— —— -3 -3 And a negative number divided by a negative also makes the number a positive X=3
