Question

nec y- 11) *x+3y=-19 Raaatek y=-5 10) -7x + 2 y = 18 6х +6ye 0 CO **+2y=21 12) 3x - 5y = 17 21+2.8 13) -7x+4y= 24 x > 227, 2yye 2 Solve each system by elimination. 15) 8x - 6y=-20 Ax - 4y= 0 24 Ye24 -2x - 2y - 10 942-1012-22 *.-28 28-hole 340 16) 6x2 = 24 -х - 6 y = 4 10 -16x + 7 y = 30

Answer 1

6x - 12y = 24 -------------(1)

-× - 6y = 4------------------(2)

Elimite x

Multiply equation (2) by 6

( -x - 6y = 4 ) x 6

-6x -36y = 24

6x - 12y = 24--------------------(1)

-6x -36y = 24---------------------(2)

add both equations together to eliminate x

6x + ( -6x) -12y + (-36y) = 24 + 24

6x - 6x -12y - 36y = 48

-48y = 48

y = 48/-48

y = -1

substitute y = -1 into equation (1)

6x - 12y = 24

6x -12(-1) = 24

6x + 12 =24

6x = 24 -12

6x = 12

x = 12/6

x = 2

Hence, x = 2 , y = -1