Question

X+4y=27 eq 1st and x+2y=21 eq 2nd

Answer 1

Step-by-step explanation:

STEP-1

[make x the subject]

x = -4y + 27 ...eq(1)

STEP-2

[subst. eq(1) into eq(2)]

x + 2y = 21

-4y + 27 + 2y = 21

-2y + 27 = 21

-2y = 21 - 27

-2y = -6

-2y/-2 = -6/-2

y = 3

STEP-3

[subst. y = 3 into eq(1)]

x = -4y + 27

x = -4(3) + 27

x = -12 + 27

x = 15

STEP-4

[co-ordinate]

(15;3)