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# Tech Math 1 - Unit5 - Objective4 Worksheet

**Part One**: Use substitution to solve the system of equations.
1)x-3y=-3
-2x+y=-4
2)2x-y=6
3x+y=4
3)2x-3y=3
x+4y=7
4)3x+4y=4
4x+10y=3
**Part Two**:Use addition or subtraction method to solve the system of equations.
1)x-3y=-3
-2x+y=-4
2)2x-y=6
3x+y=4
3)2x-3y=3
x+4y=7
4)3x+4y=4
4x+10y=3
**Part Three**: Solve using substitution or addition/subtraction method.
1) A chemist has two bottles of hydrochloric acid. One bottle is marked 40% HCL and the other is
marked 50% HCL. How much of each solution should be mixed to produce 24ml of a solution that
is 42% HCL.
2) A 10% saline solution and a 5% saline solution are to be mixed to produce 80ml of an 8% solution.
How many ml of each should be used?
**Unit 5 Outline**

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