Hi all, new here. I've recently began a home study AS/A2 course in mechanical mathematics after being outside of formal education for almost 7 years. I'm currently having problems with remembering methods taught at basic AS level, and in particular the solution and method to this pair of simultaneous equations:
5x + 4y + 5 = 3x - 7y, 4(x+3y) + 3 = 5x
Help would be greatly appreciated!
Ok, I think I've cracked it:
I first simplified the equations to;
2x + 11y = -5,
-x + 12y = -3
Then made the coefficients of y the same value:
24x + 132y = -60,
-11x + 132y = -33
then subtracted leaving with the value of x:
35x = -27,
x = -27/35
substituted back into the first equation, giving me the value of y:
5 -54/35 = -11y
y = -11/35
Is this ok?