Does the point (1, 20) satisfy the following system of equations?

y = -2x + 15

y = x +12

y = -2x + 15

y = x +12

Substitute 1, in for x, and 20, in for y, into both equations.

If you get a true statement, then yes, the point satisfies the system

y = -2x + 15

20 = -2(1) + 15 {substituted in}

20 = -2 + 15 {multiplied}

20 = 13 {added on right}

- this is a false statement, so

**no the point does not satisfy the system**

- no need to check in other equation

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