Math

Solve for both systems: y + 3x = 21 and y = - 4x + 26

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y + 3x = 21

y + 3x-3x = 21-3x

y= 21-3x

y = - 4x + 26


21-3x = - 4x + 26
21-3x+4x = - 4x+4x+ 26
21+x=26
21+x-21=26-21
x=5
y= 21-3x
y= 21-3*5
y= 21-15=6