(12 points) Explain how you will solve the pair of equations below by substitution

Show all the steps and write the solution in (x, y) form.

y = x + 4
y = −2x − 2

pls help
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What value is equivalent to 5 + [5 × (4 + 2)]? a) 35 b) 45 c) 60 d) 110

Si la base de un triángulo isósceles mide 70 m y el ángulo opuesto a ésta mide 58°; entonces ¿cuánto mide la altura de dicho triángulo? a) 21.87 m. b) 40.01 m. c) 43.74 m. d) 63.14 m.

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?