Maths Simultaneous Equation

Is there only one correct answer that the examiners mark as correct for Simultaneous Equations?

For Example: { 3x+3y=18
{ x+7y=30

The answers were (x=2)(y=4)
However,my answers was slightly different with (x=10)(y=-4)
which is still correct if you replace my answers for x & y

Reply 1

BTAnonymous

22

Original post by TMula123

Is there only one correct answer that the examiners mark as correct for Simultaneous Equations?

For Example: { 3x+3y=18
{ x+7y=30

The answers were (x=2)(y=4)
However,my answers was slightly different with (x=10)(y=-4)
which is still correct if you replace my answers for x & y

your solutions don't satisfy x+7y=30

10 - 28 =/= 30

Original post by BTAnonymous

your solutions don't satisfy x+7y=30

That's quite correct: x + 7Y = 30 Substuting x = 10 and y = -4, gives you 10 + 7 (-4) or 10 - 28 = -18, not 30

Reply 4

username2684465

12

With simultaneous equations, you're finding solutions that satisfy all of the equations.

Reply 5

TMula123

OP

4

oh **** i just deeped it :colondollar:

Reply 6

WWEKANE

11

I would advise to get the class wiz calculator. Its allowed in maths exams and solves simultaneous equations, quadratic inequalities vectors and ratio. Really useful. Would advise

Maths Simultaneous Equation

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