How do I solve -4x+5y=0
3x+2y=23 by substitution?

Question

owlfred · Answer

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anonymous · Answer

Is it necessary by substitution?
U can multiply equation (-4x+5y=0) by 2 and the other equation by 5 and then substract the two.

Or you can use equation(-4x+5y=0)  and put y= 4x/5 and put it in the second equation

anonymous · Answer

Method 1:

1. Multiply Eqn 1 by 2
-8x+10y = 0

2. Multiply Eqn 2 by 5 
15x + 10y = 115

3. Subtract these 2 equations
- 23x = -115
x = 5

4. Substitute x = 5 in Eqn 1

anonymous · Answer

Thank You so much for your help. :)