Read the passages Moon Mission and Laika.

What idea is supported by both passages?

Space exploration is often placed on a tight schedule.
Congress must approve funding for space exploration.
Spacecraft launches are typically broadcast on radios or televisions.
Sometimes vessels are sent into space without people manning them.

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4

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