12q - 4q = 8
2p+4q=16 (now divide the equation by two) p+2q=8 (now subtract 2q) p=8-2q 7p+12q=52 (substitue the answer you got for p in the previous equation) 7(8-2q)+12q=52 (multiply the first equation by 7) 56-14q+12q=52 (subtract 14q from 12q) 56-2q=52 (subtract the 56 from 52) -2q=-4 (multiply by -1) 2q=4 (divide by 2) q=2 p=8-2q (substitute the value of q) p=8-2(2) (multiply) p=8-4 (subtract) p=4 2p+4q=16 (check your answers with the new values of p and q) 2(4)+4(2)=16 8+8=16 true 7p+12q=52 7(4)+12(2)=52 28+24=52 true
If 12p + 4q = 55, then p = (55 - 4q)/12
It's 12q -5
4q + 1 = 15 4q = 16 q = 4
-12q+4=q-6 4-6=q+12q -2=13q q=-2/13
12q 2,6q 2,2,3q 2,2,3,q
6p + 12q + 18r = 6 (p + 2q + 3r)
12q 12,q 6,2,q 3,2,2,q
Do you mean: r = (4q-5p)/9? If so then: p = (9r-4q)/-5
3 -4q = 10q + 10 3 - 10 = 10q + 4q -7 = 14q q = -1/2
12q 12,q 6,2,q 3,2,2,q
If you mean: -6q+7-2+4q then it is 5-2q when simplified