You have to find what x and y equals:
1) 3x+4y=7
4x+2y=1
x= y =
2)2x+5y=15
3x-2y=13
x= y=
Please show working! Thank you.
1) 3x+4y=7
4x+2y=1
x= y =
2)2x+5y=15
3x-2y=13
x= y=
Please show working! Thank you.
-
1) Multiply the second equation by 2
3x + 4y = 7
8x + 4y =2
Take one away from another
-5x = 5
x = -1
Substitute x into any of the equations to give
y = 2.5
2) Multiply the first equation by 2 and the second equation by 5
4x + 10y =30
15 x -10y = 65
Add the equations together
19x = 95
x = 5
Substitute x into any of the above equations to give
y = 2
3x + 4y = 7
8x + 4y =2
Take one away from another
-5x = 5
x = -1
Substitute x into any of the equations to give
y = 2.5
2) Multiply the first equation by 2 and the second equation by 5
4x + 10y =30
15 x -10y = 65
Add the equations together
19x = 95
x = 5
Substitute x into any of the above equations to give
y = 2