Find x in a system by setting the expressions equal
Set the two expressions for y equal to each other and solve for x. Use x to find y.
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Solve the system: y = 5x + 17 and y = 2x + 5. What is the value of x?
Answer: -4
Solve the system: y = −x + 9 and y = 4x − 21. What is the value of x?
Answer: 6
Solve the system: y = −x + 2 and y = −3x. What is the value of x?
Answer: -1
Tip: Set the two expressions for y equal to each other and solve for x. Use x to find y.
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