Title: Does anyone know how to work this equation? Post by: ilikebigbutts on Feb 5, 2013 I have several of these equations to solve and I don't even know where to begin. Can someone break it down for me on how to work this equation? I'll be able to figure out the others once I see how it's done.
3x - y = -2 5x = y Any help is greatly appreciated. Thank You. Title: Does anyone know how to work this equation? Post by: jujubeanie on Feb 5, 2013 3x - y = -2
5x = y in the first equation, replace y with 5x: 3x - (5x) = -2 -2x = -2 x = 1 y = 5x = 5 Title: Does anyone know how to work this equation? Post by: FinnBinn on Feb 5, 2013 3x + -1y = -2
5x = 1y Think algebraically so change all subtraction to addition and think of a lone variable with a 1 in front of it. Title: Does anyone know how to work this equation? Post by: fiona6197 on Feb 5, 2013 Do you mean system of equations?
Assuming that: Since y=5x according to the second equation, you can substitute 5x for y in the first equation. 3x - 5x = -2 -2x = -2 x = 1 Plug in 1 for x in 5x=y to find y. The equation can be turned around to y = 5x y = 5(1) = 5 answer: (1, 5) Title: Does anyone know how to work this equation? Post by: nursetonya8 on Feb 5, 2013 Step 1... split up x and y
3x = y - 2 5x = y Step 2... depending on the equation, you either want to add or subtract the equations.. Subtract... -2x = 0y - 2 Step 3... solve x = 1 5x = y.... x=1 5(1) = y y = 5 Title: Does anyone know how to work this equation? Post by: finnykev on Feb 5, 2013 From the bottom equation we can see that y is 5x. This can be 'substituted' in to the top equation.
We take the 5x and place it in the top equation instead of y (as 5x = y) This gives: 3x - 5x = -2 which can be written as: -2x = -2 if we divide both sides of this equation by -2 we get: x = 1 Then we can use this in the bottom equation to give: 5*(1) = y so y = 5 hope this helps Title: Does anyone know how to work this equation? Post by: lelik on Feb 5, 2013 Okay, for starters let the first equation as #1 and the second as #2.
Since #2 has y=5x, we can use that to substitute for #1. So #1 will be 3x-5x= -2. Combine the like terms and it will be -2x= -2. Simplify and x=1. For #2, substitute x=1 to #2 so it will be 5(1)=y. Simplify and y=5. The answers are x=1 and y=5. Hope this helps!! ~Jyna Title: Does anyone know how to work this equation? Post by: nursgrl on Feb 5, 2013 3x-y=-2
5x=y 3x-y=-2 -3x -3x -------------- -y=-3x-2 y=3x+2(now plug this into the other equation) 5x=y 5x=3x+2 -3x -3x --------------- 2x=2 /2 /2 x=1(now plug this into the other equation) y=3x+2 y=3(1)+2 y=3+2 y=5 So x=1, and y=5. The proper way to write this is- (1,5) Get it? |