Question

Slove the pair of simultaneous equation -x+2y=-4 7x+3y=11

Answer 1

Step-by-step explanation:

x+2y = 4 given

x - y = 7 given

Now in the bold equation above we solve for y: -y = 7 - x so y = x - 7

Substitute this into the non-bold equation above to get

x+ 2y = 4

x + 2(x - 7) = 4

x + 2x - 14 = 4

3x = 18

x = 6 and thus y = -1 by substituting x = 6 into either the bold or non-bold equation above.

Answer 2

Answer:

first multiply EQ one throughout by 7

u will get -7x +14y = -28

then subtract these two eq

u will get y= -17 /17

which is equal to -1

now put y=-1 in ew one

u will get x = 2