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y=4x+21
y=y
x²=4x+21
x²-4x-21=0
(x-7)(x+3)=0
x=7 x=-3
nilai x positif x=7
2. y=4x-11
2x+y=1 -› y=1-2x
y=y
4x-11=1-2x
6x=12
x=2
substitusi nilai x pada salah satu persamaan
y=4(2)-11
=8-11
=-3
nilai y=-3