Using substitution or elimination please solve this

Y=7-x

x-y=-3

For this one, use substitution -->

x - y = - 3 --> x - (7 - x) = -3 --> x - 7 + x = -3 -->

2x - 7 = -3

2x = 4

x = 2

y = 7 - 2 = 5

x = 2; y = 5.

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X+2y=11

x+2y=14

For this one, use elimination -->

Subtract both equations: This yields 0 = -3 [x - x cancel out & 2y - 2y cancels out as well] which does not make sense...therefore, this system has no solution.

X+2y=11

x+2y=14