2x - 5y = 10

x=5+2.5y,all numbers fit the equation.

x=5+2.5y,all numbers fit the equation.

2x - 5y = 10

x=5+2.5y,all numbers fit the equation.

x=5+2.5y,all numbers fit the equation.

Quite right. There are 2 variables therefore you need to equations to solve.

Remember "SIMULTANEOUS EQUATIONS" in maths?

Remember "SIMULTANEOUS EQUATIONS" in maths?

X=15, y=4; 2 x 15 = 30 - 5 x 4 = 20 30 - 20 = 10 or x=10 & y=2 or any of many combinations

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