math

posted by .

x+y= 30
4x+2y=74
y+

What does the y+ signify? Are you supposed to solve for y?
Try doubling the first equation, giving you
2x + 2y = 60
and then subracting the second equation from that.
-2x = -14
Solve that easily for x, and then substitute that x in any equation to get y.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. ALGEBRA 1!PLZ HELP!

    Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve the first equation for y. y = 2x-5 Substitute that for y in the second equation and solve for x. Then use the value of x to substitute back …
  2. math

    Can someone help me figure this out. The difference of two numbers is 80. The second is 8 less than 5 times the first. What are the two numbers?
  3. algebra2

    solve the systems of equation: First : 4x-2y = 2 Second: y = -4x-7 Should i solve by using substitution, elimination or multiply then use elimination?
  4. algebra2

    solve the equation: First: x + 3y = 5 Second: 3x - y = 5 should i use substitution or add them?
  5. Algebra

    To solve the system of equations, which expression could be substituted for x into the first equation?
  6. alg.

    solve the system by addition: -5x-9y = -5 x+5y=-15 I've tried this one over and over, but I can't seem to get the right answer. I don't even really know where to start. each time i try to do it, i go about it a little differently and …
  7. Algebra 1

    What is an equation of a line perpendicular to the line with equation y = 1 - 3x a.y=-3x + 5 b. y=3x + 5 c.y=-1/3x + 5 d. y=1/3x + 5 To solve the linear system below, which substitution of unkowns is proper ?
  8. math

    uncle gives baby 25 dollars on her first birthday, 50dollars on second doubling act each year. I need help with an equation
  9. Math

    You are supposed to come up with an equation to solve this problem. I have figured out how to do it, just not what the equation is supposed to look like. Anyways, here is the word problem. The taxi fare in Gotham City is $2.40 for …
  10. Math

    The doubling function (y = y base0 2^(1/D)) can be used to model exponential growth when the doubling time is D. The bacterium Escherichia coli has a doubling period of 0.32 h. A culture of E. coli starts with 100 bacteria. a) Determine …

More Similar Questions