If x - 12y = -210 and x - 6y = 90, then x =?

Science & Mathematics by Anonymous 2018-07-14 04:34:22

Social Science

7 answers

Anonymous

x-12y=-210 2x-12y=180 -x=-390 x=390 y=50
Anonymous

- 6y = - 300 y = 50 x = 90 + 200 x = 290
Anonymous

Solving the simultaneous equations x = 390 and y = 50
Anonymous

x - 12y = -210 x = 12y - 210 x - 6y = 90 x = 6y + 90 12y - 210 = 6y + 90 6y = 300 y = 50 x = 6(50) + 90 = 390
Anonymous

2x - 12y = 180 x - 12y = -210 subtract x = 390
Anonymous

x - 12y = -210 x - 6y = 90 6y = 300 y = 50 x = 390
Anonymous

x = (-210 × -6 - -12 × 90) / (1 × -6 - -12 × 1) = (1260 + 1080) / (-6 + 12) = 2340 / 6 = 390 If ax+by=c and dx+ey=f intersect at a single point then x = (ce - bf) / (ae - bd)