algebra

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solve the following simultaneous equations

5y=13
x+y/2+30=0

2x-2y=9
2x+2y=9

The first set, I have no idea and the second set I tried but wish to double check.

  • algebra -

    try to get x or y singled out in the easiest equation (or just pick)

    fe for the first one : y = 13/5
    fe for the second one : x = (2y+9)/2

    then fill in that x or y in the other equation

    fe for the first one : x+(13/5)/2 +30 = 0
    fe for the second one : 2*((2y+9)/2) + 2y = 9

    by this you have 1 equation with 1 unknown, calculate, once you get the final result for x or y, fill it in in the other equation to get y or x

    glhf

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