Question

What are some tips on how to write equations for linear systems word problems? I need help mostly with coming up with the equations.

Answer #1

to write equations of linear system

we must read the problem carefully

then denote the unknowns with variables

set up the equation based on the information

and solve the system for the variable

for example : sum of two numbers is 25 . one number exceeds the other by 9 . find the numbers

solution : lets say numbers are x and y

so, x + y = 25

x - y = 9

solving the two equations by adding them up

2x = 34

dividing both sides by 2

x = 17

y = 25-17 = 8

so, two numbers are 17 , 8

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