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4x-y=8 Add y both sides wht do u gt ?
i dont understand
Adding y both sides 4x-y+y=8+y 4x=8+y
Gt it till right here ?
what do i do next
Actually what you are being asked to do is find an expression for y in terms of x, and substitute that into the second equation. So if your two equations are 4x − y = 8 2x + 3y = 9 Then from the first equation we have that -y = 8 - 4x hence y = -8 + 4x or y= 4x - 8 This is the expression you would substitute into the second equation, as in 2x + 3y = 9 thus 2x + 3(4x - 8) = 9 Note the the question is NOT asking you to solve the equations. It is just asking you to find an expression for y from the first of each pair of equations which you would substitute into the second equation.
so it's -8-4x?
No 4x - y = 8 Hence -y = 8 - 4x and thus y = -(8-4x) y = 4x - 8
but what if that isnt one of the choices
But it IS one of the choices.
4x - 8 is equal to exactly one of these expressions: 8 − 4x 8 + 4x −8 + 4x −8 − 4x
4x - 8 Can it be 8 - 4x, I don't think so, because if it were then 4x - 8 = 8 - 4x = -(4x - 8)
Remember that a + b = b + a. This is called the commutative property of addition. Hence 4x - 8 = -8 + 4x