He is RENE DESCARTES
or R. DESCARTES
R ----- 3x - y = 2
D ----- y = -x + 4
E ----- 5x - 7y = 2
S ----- 5x + 2y = 7
C ----- y = -2x + 6
A ----- y = 3x - 8
R ----- 2x + y = 9
T ----- x + 2y = 4
E ----- y = 1/2 + 3
S ----- y = 5x + 7
Step-by-step explanation:
Hope it helps.