Question

4x+3y=55 an 5x-3y=35 substitution method???

Answer 1

4x+3y=55---(a)
5x-3y=35---(b)

from equation (b) y = (5x-35)/3
substitute this expression of y in equation (a)

4x+3(5x-35)/3 = 55
4x+(5x-35)=55
9x-35=55
9x=90
x=10

put x=10 in (a)
4(10)+3y=55
3y=55-40=15
y=15/3 =5
y=5

x=10 y=5

Answer 2

find y for 2x+2y=2 and x+2y=1 ?????

Answer 3

2x+2y=2---(a)
x+2y=1 ---(b)
multiply eq (b) with 2 and subtract from eqn (a)

2x+2y=2---(a)
(-) 2x+4y=2
----------------
0-2y = 0
y=0