3y+2y+4+1=80 5y+5=80 5y=80-5 5y=75 y=15
Multiply the bottom equation by -1
5y = 3y + 12 5y - 3y = (3y - 3y) + 12 2y = 12 y = 6
3y - 3 = 2y + 5 3y - 2y = 5 + 3 y = 8
5y-2y= 3y+2 5y-2y-3y= 2 0y= 2
2y + 3 = 3y + 9 2y - 3y = 9 - 3 or -y = 6 so y = -6
Multiply the top equation by 3 and the bottom equation by 2. (-4, 1)
7x = -3y + 12
3x plus 2y - 3 is an expression. There can be no answer to one expression and one linear equation in two variables.
9y-3y=6y; 6y+2y=8y; so your answer is 8y
If 3y = 12, 2y = 8
The equation for 3y + 3y = -1 is 3y + 3y = -1.
Multiply first equation by 1.5, giving 3x + 3y = 12, but we are told that 3x + 3y = 6. If there isn't an error in the question then 2 = 1!